Smartphone notifications, touchscreen functionality, activity tracking, custom goal & alarm settings, customizable watch faces & watch bands, music controls & micro apps Powered with Wear OS by Google, a trademark of Google LLC. Compatible with Android OS 4.4+ (excluding Go) and iOS 9.3+. All devices have Bluetooth(R) 4.1 Low Energy and Wi Fi 802.11 b/g/n Case Diameter: 48mm Water resistant to 50m (165ft: in general, suitable for short periods of recreational swimming, but not diving or snorkeling Compatible with iPhone and Android devices Your battery will last up to 24 hours, depending on usage.