Apple Watch Series 1
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Apple Watch Series 1
Apple Watch
Apple Watch official logo.svg
White AppleWatch with Screen.png
An Apple Watch with white Sport Band
Developer Apple Inc.
Manufacturer Quanta Computer[1]
(contract manufacturer)
Type Smartwatch
Release date Original: April 24, 2015; 2 years ago (2015-04-24)
Series 1 and Series 2: September 16, 2016; 17 months ago (2016-09-16)
Series 3: September 22, 2017; 5 months ago (2017-09-22)
Operating system watchOS
System-on-chip used Apple Watch Original: Apple S1
Apple Watch Series 1: Apple S1P
Apple Watch Series 2: Apple S2
Apple Watch Series 3: Apple S3
Memory Original,[3] Series 1, and Series 2: 512 MB DRAM[]
Series 3: 768 MB DRAM[]
Storage Original,[3] Series 1, and Series 2:GB[]
Series 3: 8 or 16 GB[]

33.96 mm (1.337 in) diagonal, 272×340 pixels, 326 dpi
38.96 mm (1.534 in) diagonal, 312×390 pixels, 326 dpi

Strengthened Ion-X glass or Sapphire glass
Graphics PowerVR SGX543[5]
Connectivity Original, Series 1, and Series 2: Bluetooth 4.0[]
Series 3: Bluetooth 4.2[]
All models: NFC, Wi-Fi (802.11 b/g/n 2.4GHz only)
Diagnostics port

Built-in rechargeable Li-Po battery


38 mm
38.6 mm × 33.3 mm × 10.5 mm
(1.52 in × 1.31 in × 0.41 in)

42 mm
42 mm × 35.9 mm × 10.5 mm
(1.65 in × 1.41 in × 0.41 in)
iPhone 5s or iPhone 6 and later running iOS 11 or later, connected via Wi-Fi or Bluetooth.

Apple Watch is a line of smartwatches designed, developed, and marketed by Apple Inc. It incorporates fitness tracking and health-oriented capabilities with integration with iOS and other Apple products and services.

Apple Watch relies on a wirelessly connected iPhone to perform many of its default functions such as calling and texting. Series 3 LTE Apple Watches are able to be used without needing to be consistently connected to an iPhone, though an iPhone is still required to set up the device. Most Apple Watches that are currently produced require an iPhone 5s or later with iOS 11; the Series 3 LTE model requires an iPhone 6 or later with iOS 11.[8]

The Apple Watch was released on April 24, 2015[9][10] and quickly became the best-selling wearable device with 4.2 million sold in the second quarter of the 2015 fiscal year.[11][12]

The second generation of Apple Watches were released in two tiers in September 2016: the Apple Watch Series 1 and Apple Watch Series 2, while the first generation was discontinued.[13][14]

The Apple Watch Series 3 was released on September 22, 2017 alongside the discontinuation of the Apple Watch Series 2.[15] Apple still produces the second-generation Series 1 Apple Watch as an entry-level device.[16]


The goal of the Apple Watch was to enhance the uses of an iPhone while also providing the user with some additional new features.[17]Kevin Lynch was hired by Apple to make wearable technology for the wrist. He said: "People are carrying their phones with them and looking at the screen so much. People want that level of engagement. But how do we provide it in a way that's a little more human, a little more in the moment when you're with somebody?"[17] Apple's development process was held very much under wraps until a Wired article revealed how some internal design decisions were made.[17]

Rumors surrounded an Apple-developed wearable device back as far as 2011, which conceptualized the device as a variation of the iPod that would curve around the user's wrist, and feature Siri integration.[18] On February 10, 2013, both The New York Times and The Wall Street Journal reported that Apple was beginning to develop an iOS-based smartwatch with a curved display.[19] On February 12, 2013, Bloomberg reported that Apple's smartwatch project was "beyond the experimentation phase in its development", and had a team of at least 100 designers working on the project.[20] Further reports in March 2013 indicated that Apple planned to release the device by the end of the year.[21] In July 2013, Financial Times reported that Apple had begun hiring more employees to work on the smartwatch, and that it was targeting a possible retail release in late 2014.[22]

Unveiling and release

In April 2014, Apple CEO Tim Cook told The Wall Street Journal that the company was planning to launch new product categories that year, but did not reveal any specifics.[23] In June 2014, Reuters reported that production was expected to begin in July for a release in October.[24]

On September 9, 2014, during a press event where the iPhone 6 was also presented, the new product was introduced by Tim Cook as "the next chapter in Apple's story" with a video that focused on its design and the various combinations of bands and case styles that would be available to the consumers. After the reveal video, the auditorium was filled with prolonged applause and a standing ovation as Tim Cook reappeared onstage wearing an Apple Watch. Cook explained that Apple Watch was "a precise timepiece, a new intimate way to communicate from your wrist, and a comprehensive health and fitness device."[25][26]

In comparison to other Apple products and competing smartwatches, marketing of Apple Watch focused more on advertising the device as a fashion accessory; a 12-page advertising spread for Apple Watch in an issue of Vogue focused primarily on the different combinations of body and band styles available, and downplayed the technological aspects of it.[27][28] Apple later focused upon its health and fitness-oriented features, competing against dedicated activity trackers,[29] and with WatchOS 3, expanded on them with fitness tracking for wheelchair users, social sharing in the Activity app, and a Breathe app to encourage mindfulness.


Pre-orders for the Apple Watch began on April 10, 2015, with the official release on April 24.[30]

The device was not branded as "iWatch" (which would put it in line with its pre-existing product lines such as iPod, iPhone, and iPad) due to trademark conflicts in certain territories; in the United States, the "iWatch" trademark is owned by OMG Electronics -- who was crowdfunding a device under the same name, and is owned in the European Union by Irish firm Probendi.[31][32] In July 2015, Probendi sued Apple Inc. for trademark infringement, arguing that through keyword advertising on the Google search engine, it caused advertising for the Apple Watch to appear on search results pages when users searched for the trademarked term "iWatch".[33]

Initially, the Apple Watch was not available at the Apple Store. Beginning on April 10, 2015, customers could make appointments for demonstrations and fitting, but the device was not in-stock for walk-in purchases and had to be reserved and ordered online. CNET felt that this distribution model was designed to prevent Apple Store locations from having long line-ups due to the high demand.[34][35] Selected Apple Watch models were available in limited quantities at luxury boutiques and authorized Apple resellers.[36] On June 4, 2015, Apple announced that it did plan to stock Apple Watch models at its retail locations.[35] On August 24, 2015, Best Buy announced that it would begin stocking Apple Watch at its retail stores by the end of September.[37] Both T-Mobile US and Sprint also announced plans to offer Apple Watch through its retail stores.[38]

On September 9, 2015, Apple launched a new subset of Apple Watch in collaboration with Hermès. This collection, dubbed "Apple Watch Hermès," comes in a stainless steel body with crafted leather bands in distinctive styles from Hermès.[39] The following year, Apple launched another subset of Apple Watches in collaboration with Nike dubbed "Apple Watch Nike+". Both subsets feature additional watch faces and bands exclusive to their branding, but otherwise function exactly like standard Apple Watches of their series.[40]

Apple Watch went on sale in India on November 6, 2015.[41] The device has also launched in Chile, the Philippines, Indonesia, and South Africa.[42][43]



The Apple Watch is available in multiple variants, distinguished by different combinations of casing and interchangeable bands.[44] The watch is available in two sizes: 38 mm (1.5 in) and 42 mm (1.7 in).[45] The design of the watch has not changed significantly since its release, so customizable bands and accessories are typically compatible with any Apple Watch of the associating size. The casing of the watch includes a mechanism to enable the straps to be interchangeable. For input, the watch includes a "digital crown", which can be turned to scroll or zoom and pressed to return to the home screen, and a touchscreen that features Force Touch technology, which makes it pressure-sensitive and capable of distinguishing between a tap and a press.[4] The watch also has a side button which can be used to display favorite contacts and access Apple Pay.[46] Apple rates the device's battery for 18 hours of mixed usage.[4][47] Apple Watch is charged by means of inductive charging, using a cable similar to the MagSafe cable from Apple's MacBook family of laptops.[9] If the watch's battery depletes to less than 10 percent, the user is alerted and offered to enable a "power reserve" mode, which allows the user to continue to read the time for an additional 72 hours. The watch then reverts to its original mode when recharged.[48]

Apple did not explicitly market the first generation Apple Watch as being waterproof, stating that it can withstand splashes of water (such as rain and hand washing), but does not recommend submersion (IPX7). However, external testing by The Iconfactory and others revealed that Apple Watch can function when submerged in various conditions (such as swimming), although its touchscreen experiences "erratic" behavior when submerged.[49][50]

Apple introduced a high level of water resistance with the release of the Apple Watch Series 2, and the device was explicitly advertised as being suitable for swimming and surfing.[51]


First generation

The first-generation Apple Watch uses the single-core S1 system-on-chip. It does not have a built-in GPS chip, instead relying on a paired iPhone for location services. It uses a linear actuator called the "Taptic Engine" to provide haptic feedback when an alert or a notification is received, and is used for other purposes by certain apps.[4] The watch is equipped with a built-in heart rate sensor, which uses both infrared and visible-light LEDs and photodiodes.[52] All versions of the first-generation Apple Watch have 8 GB of storage; the operating system allows the user to store up to 2 GB of music and 75 MB of photos. When the Apple Watch is paired with an iPhone, all music on that iPhone is also available to be controlled and accessed from the Apple Watch.[53]

Second generation

The second generation has two tiers. The Series 1 has a variant of the Apple S2 processor with GPS removed known as the Apple S1P. It has a lower starting price than first generation watches.[54] The Series 2 has the dual-core Apple S2 processor, water resistance to 50 meters, a display twice as bright, and a GPS receiver.[54][51]

Third generation

The third generation of the Apple Watch features a faster processor, the dual-core S3, Bluetooth 4.2 vs 4.0 on older models, a built-in altimeter for measuring flights of stairs climbed, increased RAM size, and is available in a variant with LTE cellular connectivity. Siri is able to speak on Apple Watch Series 3 due to the increased processing speed of the Watch.[55] The Series 3 Apple Watch is explicitly not compatible with iPhone 5 devices, requiring users to have an iPhone 5s or later for the GPS-only model, or an iPhone 6 or later for the cellular-enabled model.


Apple Watch runs watchOS, whose interface is based around a home screen with circular app icons. The OS can be navigated using the touchscreen or the crown on the side of the watch.[4] During its debut, the first generation Apple Watch needed to be paired with an iPhone 5 or later running iOS 8.2 or later; this version of iOS introduced the Apple Watch app, which is used to advertise Apple Watch, pairing with an iPhone, customize settings and loaded apps, and highlight compatible apps from the App Store.[4]

With the release of watchOS 4 and the Series 3 Apple Watch, iPhone 5 support was dropped, requiring users to use an iPhone 5s or later with iOS 11 to use watchOS 4. Apple Watches still running watchOS 3 or below remain compatible with the iPhone 5.

The Apple Watch is capable of receiving notifications, messages, and phone calls via a paired iPhone.[4] "Glances" allowed users to swipe between pages containing widget-like displays of information; however, this feature was replaced by a new Control Center. WatchOS also supports Handoff to send content from Apple Watch to an iOS or OS X device,[4] and act as a viewfinder for an iPhone camera,[46]Siri is also available for voice commands, and is capable of responding with voice prompts on the Series 3 watches.[4] Apple Watch also supports Apple Pay, and enables its use with older iPhone models that do not contain near-field communication (NFC) support.[4]

Apple Watch's default apps are designed to interact with their iOS counterparts, such as Mail, Phone, Calendar, Messages, Maps, Music, Photos, Reminders, Remote (which can control iTunes and Apple TV), Stocks, and Wallet.[4] Using the Activity and Workout apps, a user can track their physical activity and send data back to the iPhone for use in its Health app and other HealthKit-enabled software.[4] With WatchOS 3, Reminders, Home, Find My Friends, Heart Rate, and Breathe were added to the many stock apps.

Version history

WatchOS 1.0.1 featured performance improvements and support for additional emoji and languages,[56] and was released on May 29, 2015. At WWDC 2015, Tim Cook announced watchOS 2.0; described by CNET as a "significant revamp", it included a new software development kit that allows more direct access to the device's hardware, new watch faces, the ability to reply to an e-mail, and other features.[57] watchOS 2.0 was set to be released on September 16, 2015, but was delayed due to a bug fix taking longer than expected;[58] it was instead released on September 21, 2015.[59]

WatchOS 2.0 featured new features and more general improvements to Apple Watch. Following the software update, some users experienced issues with lag.[60]

WatchOS 3.0 was announced at WWDC 2016, with a priority on performance. Users are able to keep apps running in memory as well as receive background updates and refreshed information. Other updates include a new Dock invoked with the side button to replace the performance-laden Glances, an updated Control Center, and new reply options on Messages. Several new watch faces have also been added, including Minnie Mouse, along with the ability to switch watch faces from the lock screen simply by swiping. A new feature called SOS allows users to hold the dock button to make a call to the local emergency line and pull up the user's Medical ID. Another feature is Activity Sharing, which allows sharing of workouts with friends and even sending their heartbeats to one another. A new app called Breathe guides users through breathing exercises throughout the day, with visuals and haptic feedback. watchOS 3.0 was released to developers on June 13, 2016 and was made available to the public on September 13, 2016.

WatchOS 3.1 was released to the public on October 24, and watchOS 3.2 was released near the end of March, 2017.[61] Both updates added minor improvements and bug fixes.

WatchOS 4.0 was announced at WWDC 2017 on June 5, 2017, and released to the public on September 19. WatchOS 4 features a proactive Siri watch face, personalized activity coaching, and an entirely redesigned music app. It also introduces GymKit, a technology platform to connect workouts with cardio equipment.

Third-party apps

WatchOS supports third-party applications; a WatchKit app runs in the background on the iPhone as an application extension while a set of native user interface resources are installed on Apple Watch.[62][needs update] Thus, watchOS apps must be bundled within their respective iOS app, and are synced to the watch either manually, or automatically upon installation of the phone app.[4]

Starting June 1, 2016, the only new watch apps allowed on the App Store will be those developed with the watchOS 2 (or later) SDK; no third-party languages or SDKs can be used to develop apps.[63]


An Apple Store showcase with various Apple Watch models.

As of October 2017, three generations and four series of Apple Watch have been released. The series in bold are the current generation of the device:

  • Apple Watch (2015-2016)
  • Apple Watch Series 1 (2016-present)
  • Apple Watch Series 2 (2016-2017)
  • Apple Watch Series 3 (2017-present)

Apple Watch Series 2 and Series 3 models are divided into four "collections": Apple Watch, Apple Watch Nike+, Apple Watch Hermès and Apple Watch Edition. They are differentiated by combinations of cases, bands, and exclusive watch faces; Apple Watch comes with either aluminum or stainless steel cases, and various watch bands; Apple Watch Nike+ uses aluminum cases and special variants of sport band; Apple Watch Hermès uses stainless steel cases and Hermès watch bands; and Apple Watch Edition comes with ceramic cases (the original generation Apple Watch Edition used 18 karat gold).[64]

Apple Watch Series 1 models are only available with aluminum cases and sport bands.[65]

Apple Watch Series 3 models are sold in a variant that allows for cellular LTE capability.

Each model comes in a 38- or 42-millimeter body, with the 42 mm size having a slightly larger screen and battery.[4] Each model has various color and band options. Featured Apple-made bands include colored sport bands, sport loop, woven nylon band, classic buckle, modern buckle, leather loop, milanese loop, and a link bracelet.[4]

Comparison of Models

Specification[66] Original (Series 0)[67] Series 1[54][66] Series 2[54] Series 3[68][66]
System on chip (SoC)[66] Apple S1[67] Apple S1P[54][66] Apple S2[54] Apple S3[68][66]
Global Positioning System (GPS) and GLONASS[66] No[67] No[54][66] Built-in[54] Built-in, including Galileo and QZSS[68][66]
Cellular (LTE / UMTS)[66] No[67] No[66] No[54] Optional (eSIM)[68][66]
Water resistance[66] IPX7 splash resistant (up to 1 meter)[67] IPX7 splash resistant (up to 1 meter)[54][66] ISO 22810:2010 water resistant (up to 50 meters)[54] ISO 22810:2010 water resistant (up to 50 meters)[68][66]
Wireless networking[66] WiFi (802.11 b/g/n 2.4 GHz)[67] WiFi (802.11 b/g/n 2.4 GHz)[54][66] WiFi (802.11 b/g/n 2.4 GHz)[54] WiFi (802.11 b/g/n 2.4 GHz)[68][66]
Bluetooth[66] Bluetooth 4.0[67] Bluetooth 4.0 / Bluetooth 4.2[54][66] Bluetooth 4.0[54] Bluetooth 4.2[68][66]
Heart rate monitor[66] Yes[67] Yes[54][66] Yes[54] Yes[68][66]
Accelerometer[66] Yes[67] Yes[54][66] Yes[54] Yes[68][66]
Gyroscope[66] Yes[67] Yes[54][66] Yes[54] Yes[68][66]
Ambient light sensor[66] Yes[67] Yes[54][66] Yes[54] Yes[68][66]
Altimeter[66] No[67] No[54][66] No[54] Yes[68][66]
Display[66] OLED Retina display with Force Touch (450 nits)[67] OLED Retina display with Force Touch (450 nits)[54][66] Second-generation OLED Retina display with Force Touch (1000 nits)[54] Second-generation OLED Retina display with Force Touch (1000 nits)[68][66]
Central Processing Unit (CPU) 520 MHz Single-Core[3] 780 MHz Dual-Core[] 780 MHz Dual-Core[] Dual-Core[66]
Storage GB[3] 8 GB[66] 8 GB[] Non-LTE: 8 GB[66]
LTE: 16 GB[66]
Random Access Memory (RAM) 512 MB DRAM[3] 512 MB DRAM[] 512 MB DRAM[] 768 MB DRAM[69]
OS Versions watchOS 1 to 4[67] watchOS 3 to 4[] watchOS 4[68]
Requires[A] iPhone 5 or later running iOS 8.2 or later[67] iPhone 5 or later running iOS 10 or later[70] Non-LTE: iPhone 5S or later running iOS 11 or later[68]
LTE: iPhone 6 or later, running iOS 11 or later[68]
Battery 205 mAh, 3.8 V, 0.78 Wh battery capacity (38 mm)[]

250 mAh, 3.78 V, 0.93 Wh battery capacity (42 mm)[]

205 mAh, 3.8 V, 0.78 Wh battery capacity (38 mm)[]

250 mAh, TBC V, TBC Wh battery capacity (42 mm)[]

273 mAh, 3.77 V, 1.03 Wh battery capacity (38 mm)[]

334 mAh, 3.80 V, 1.27 Wh battery capacity (42 mm)[]

Non-LTE: 262 mAh, 3.81 V, 1.00 Wh battery capacity (38 mm)[]

TBC mAh, TBC V, TBC Wh battery capacity (42 mm)[]
LTE: 279 mAh, 3.82 V, 1.07 Wh battery capacity (38 mm)[] 352 mAh, TBC V, 1.34 Wh battery capacity (42 mm)[]

Greenhouse Gas Emissions 50 kg CO2e[71] 20 kg CO2e[72] 30 kg CO2e[73] Non-LTE: 28 kg CO2e[74]

LTE: 36 kg CO2e[75]

  • ^[A] At time of original release.


An Apple Store opens its doors on the first day of sales of the Apple Watch.

Following the announcement, initial impressions from technology and watch industry observers were varied; the watch was praised by some for its "design, potential capabilities and eventual usefulness",[76] while others offered criticism of these same aspects.[76] Venture capitalist Marc Andreessen said he "can't wait" to try it,[77] and Steve Jobs' biographer Walter Isaacson described it as "extremely cool" and an example of future technology that is "much more embedded into our lives".[78] However, Evan Dashevsky of PC Magazine said it offered nothing new in terms of functionality compared to the Moto 360, except the customizable vibration notifications.[79] In November 2014, Apple Watch was listed by Time as one of the 25 Best Inventions of 2014.[80]

Initial reviews for the device have been generally positive with some caveats.[81] Reviewers praised the watch's potential ability to integrate into everyday life and the overall design of the product, but noted issues of speed and price. Many reviewers described the watch as functional and convenient, while also noting failure to offer as much potential functionality as preceding smartphones. Farhad Manjoo of The New York Times mentioned the device's steep learning curve, stating it took him "three long, often confusing and frustrating days" to become accustomed to it.[82] Some reviewers also compared it to competing products, such as Android Wear devices, and claimed "The Smartwatch Finally Makes Sense".[83] Reviewers had mixed opinions on battery life though, with Geoffrey Fowler of The Wall Street Journal saying "the battery lives up to its all-day billing, but sometimes just barely,"[83] and others compared it to the Samsung Gear 2, which "strolls through three days of moderate usage."[84] Tim Bradshaw of the Financial Times used several applications over a period of days. He concluded that there is no "killer application" so far besides telling the time, which is the basic function of a wristwatch anyhow.[85]

When using the Apple Watch, some users have reported issues using the heart monitoring feature due to permanent skin conditions including tattoos. The Watch uses photoplethysmography technology (PPG) which utilizes the green LED lights to measure heart rates.[86] To gauge a user's heart rate, the watch flashes green light from the LEDs at the skin and records the amount of this light that is absorbed by the red pigment of the blood.[87] However, under certain circumstances the skin may not allow for the light absorption to be read properly and thus provide inaccurate results.[88]

Some users have complained that the logo and text on the back of the Apple Watch Sport model, primarily the space gray version,[89] can be easily worn off.[90]

The first generation Apple Watch Edition, where 18 k gold models retailed from US$10,000 to US$17,000, received a lukewarm reception as the Apple brand "hasn't established its value yet in gold" compared to similar-priced timepieces from Rolex and Patek Philippe.[] These Swiss luxury manufacturers were known for their "products' intricate craftsmanship [that] justifies that high price tag". An analyst suggested "What makes a high-end watch? It's the Swiss movements, the inner workings. That's why collectors buy them. This [Apple Watch Edition] has none of that. It's inserting a high-end case on a piece of electronics" which was not endlessly upgradable and would become obsolete in a couple years like other tech gadgets. In addition, Apple Retail Stores that carry the Apple Watch Edition would be "totally antithetical to their current retail model", according to the Jewelers' Security Alliance, since "You can't have people touching it. You can't have it out on counters. You have the same problems that retail jewelers have, in terms of distraction thefts, in terms of switching, in terms of grab and runs".[91][92] Apple has apparently given up on competing in the luxury watch market after failing to make much headway, as the second-generation Apple Watch Edition is made of ceramic and sells for US$1,249.[93]


Financial analysts offered early sales estimates from a few million to as many as 34.7 million in the first year.[94]Times Tim Bajarin summarized the breadth of reactions, writing that "there is not enough information yet to determine how this product will fare when it finally reaches the market next year".[76]

Owing to the inadequacy of materials, the Apple Watch's delivery was delayed from its initial pre-order release date of April 10, 2015.[95] As a result, only 22 percent of the pre-ordered Apple Watches were dispatched in the United States during the weekend after the release date.[96] It is estimated Apple received almost one million Apple Watch pre-orders in the United States during the initial six hours of the pre-order period on April 10, 2015, after which it sold out and further orders would start delivering in June.[97] A report later on by an analyst stated that Apple Watch was already a $10 billion business during its first year.[98][99][100]

Apple has not disclosed any sales figures of for the Apple Watch.[101] An estimate by IDC states Apple shipped over 12 million units in 2015.[102] In late 2016, a veteran of the Swiss watch industry said Apple sold about 20 million watches and had a market share of about 50 percent.[103]

See also


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