The Apple Watch uses the s1 system on chip. It uses a liner actuator called the Taptic Engine to provide haptic fedback when an alert or a notification is received, and is used for other purposes by certain apps.The watch is equipped with a built-in heart rate sensor, which uses both infrared and visible-light leds and photo diodes.
All versions of the 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 from the Apple Watch. So Apple’s watch I think it’s good. But if you think to buy APPLE WATCH so you can go and check out a review on YouTube