System Requirements:android5.0+ / ios10.0+Master chip:BT8918B Bracelet memory:8Mbit+32Mbit Bluetooth for calls:support Bluetooth version:4.0/5.0 heart rate sensor：support Pedometer sensor：support Screen display："1.99-inch display screen320*380 resolution" Battery capacity：180mAh Standby time：7-15Days Usage time：3-5Days Button method："Touch+encoder button+power button+Sports shortcut key" Motor：support Charging port：Wireless charging Waterproof level：IP67Sensor:G-sensor 3 Axis Local Dial:5+ Dial market:50+ Menu style:5 APP:HryFine