Lenovo R1BK Smart watch, Screen type: TFT; Screen size: 1.3” all touch screen; Bluetooth: 4.0; IP68 Water Proof; RAM: 64KB;Useing time: 7-10 days; Charging time: 2-3 hours; Standby time: 30 days; Compatability: Android 4.4 and iOS 8.0 and above