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Apple is using three different materials for the cases: 7000-Series aluminium for the Sport, 316L stainless steel for the Watch, and 18-karat gold for the Edition. Ihe Edition is available in silver and anodized space gray, silver and diamond, and yellow and rose gold respectively. The screens are Ion-X (ion exchange) glass for the Sport and sapphire for the Watch and Edition. The backs are a composite material for the Sport with hard-coated optical polymer sensor lenses, and zirconia ceramics for the Watch and Edition, with sapphire lenses. A large number of bands are available.
The 38mm Apple Watch has a display size of 340 by 272 pixels. The 42mm Apple Watch has a display size of 390 by 312 pixels. The display is from Retina-OLED (organic light-emitting diodes), which is first for Apple. There are two physical buttons for the control on the side: a button and a digital crown with which the user can zoom the screen or look for apps. Additionally, there is a way to use the voice navigation [[Apple Siri|Siri]], known from the iPhone. To answer the call one uses a built-in speaker and microphone. The apps are the same like as for the iPhone. Responses for email or messages can be faster than from the phone. The adjustment of the notification for any apps is by user discretion. Apple Watch measures all types of movement, such as walking or taking the stairs. It even keeps track of when person stands up and encourages the user to keep moving. Charging is similar to the MacBook Air or Macbook Pro. Apple set battery life expectations at up to 48 hours of time display, 6.5 hours of audio playback, 6.5 hours of workout monitoring, and three hours of talk time. A power reserve mode, designed to last up to 72 hours shuts down almost all processes except those required to keep and display time. The Watch requires about 2,5 hours, for charging and it is is waterproof. <ref name="ref7"/>
=== Purpose ===
