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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. In June 2014, Reuters reported that production was expected to begin in July for a release in October.
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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.
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re-orders for the Apple Watch began on April 10, 2015, with the official release on April 24. 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
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The Apple Watch Series 1 has a dual core processor that makes it up to 50% faster than the original design, with a built-in accelerometer for speed, and a gyroscope for direction.
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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
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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.The Series 2 has the dual-core Apple S2 processor, water resistance to 50 meters, a display twice as bright, and a GPS receiver.
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The fourth generation of the Apple Watch[62] was revealed during the 2018 Apple Special Event held at the Steve Jobs Theater in Cupertino, California. It features larger displays with thinner bezels and rounded corners, a slightly rounder, thinner chassis with a redesigned ceramic back, a new S4 64-bit dual-core processor capable of up to double the S3's performance, new options for watch face customization, and a new electrical heart sensor which works by measuring the potential difference.
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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.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.
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The Apple Watch is available in multiple variants, distinguished by different combinations of casing and interchangeable bands.[50] The watch is available in two sizes: 38 mm (1.5 in) and 42 mm (1.7 in).[51] 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
