Choose your model of Smartwatch:
Apple Watch (38 mm, Original & Series 1) Rear Cover
This plastic rear cover includes 4 sensor lenses.
A smartwatch is a computerized wristwatch with functionality enhanced beyond timekeeping, often with features comparable to a PDA.
It is a wrist worn timepiece that does more than just tell the time. It has an operating system and can run apps. It may also include GPS, Bluetooth connectivity, WiFi capability and more.