Apple Watch Hardware

Hardware

The Apple Watch uses Apple's S1 processor, advertised as "an entire computer architecture on a single chip". It also uses a linear actuator called the "Taptic Engine" to provide haptic feedback when an alert or a notification is received. The watch is equipped with a built-in heart rate sensor, which uses both infrared and visible-light LEDs and photodiodes.[12] It is water-resistant with IPX7 rating, so water submersion is not recommended.[13] All versions of the Apple Watch have 8 GB of storage, which allows the user to store up to 2 GB of music and 75 MB of photos, however, this limitation only applies when the Apple Watch is untethered from the user's iPhone; when the Apple Watch is paired with an iPhone all music and photos on that iPhone are available from the Apple Watch.[14] It uses a Flexible Retina AMOLED screen. This is the first Apple product to use AMOLED technology.[15]

The watch is compatible with the iPhone 5 and later running iOS 8.2 or later, connected via Wi-Fi or Bluetooth 4.0.[16]