K88H Smart Bluetooth Watch Heart Rate Monitor Smartwatch MTK2502 Siri Function Gesture Control For iOS/Andriod - Silver OS Compatibility: Android 4.4 / iOS 7.0 and above system Screen Size: 1.2 inch Bluetooth: Bluetooth 4.0 Battery Type: Polymer batteries Height: Product size (L x W x H): 24.5 x 4.4 x 1.2 cm Depth: Dial size: 4.4 x 4.4 x 1.2 cm Weight: 77 g Package Content: 1 x K88H Smart Watch, 1 x USB Charging Cable, 1 x English/Chinese Manual