The Apple Watch is a line of smartwatches designed, developed, marketed and sold by Apple Inc. It incorporates fitness tracking and health-oriented capabilities with integration with iOS and other Apple products and services.
Apple Watch uses a wireless connection to an iPhone to perform functions such as calling and texting. However, the watch has limited connectivity away from the phone when a Wi-Fi network is available. Series 3 LTE Apple Watches can connect to a cell network, largely obviating the need for an iPhone after initial setup. First-generation and Series 1 and 2 Apple Watches require an iPhone 5 or later with iOS 10 or later; Series 3 and later LTE models require an iPhone 6 or later with iOS 11 or later.
The Apple Watch was released on April 24, 2015 and quickly became the best-selling wearable device: 4.2 million were sold in the second quarter of fiscal 2015.
The second generation of Apple Watches was released in two tiers in September 2016 — the Apple Watch Series 1 and Apple Watch Series 2 — while the first generation was discontinued.
The Apple Watch Series 3 was released on September 22, 2017, when the Apple Watch Series 2 was discontinued.
The Apple Watch Series 4 was announced on September 12, 2018; Apple Watch Series 1 was discontinued.
The Apple Watch Series 5, announced on September 10, 2019, became available on September 20, 2019. Series 4 was discontinued. Apple Watch Series 3 now sells at a lower price-point.
The Apple Watch is available in multiple variants, generally distinguished by the material, color, and size of the casing, with special bands and watchfaces available for certain variants co-branded with Nike and Hermès, which are also sometimes accompanied by other unique extras, like stainless steel charging pucks, premium packaging, and exclusive color basic bands.
The Series 4 and Series 5 have been made available two sizes, 40 mm (1.6 in) and 44 mm (1.7 in), replacing the 38 mm (1.5 in) and 42 mm (1.7 in) sizes of the original, Series 2, and Series 3 models. 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 same size, while 38 mm (1.5 in) straps also fit 40 mm (1.6 in) watches, and 42 mm (1.7 in) straps fit 44 mm (1.7 in) watches. 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. The watch also has a side button which can be used to display recently used apps and access Apple Pay. Apple rates the device's battery for 18 hours of mixed usage. Apple Watch is charged by means of inductive charging, using a cable similar to the MagSafe cable from Apple's MacBook family of laptops. 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.