JingXiGuoJi Novelty Unisex Bluetooth 2.1 Smart Wrist Watch Bracelet Sport Gym Fitness Tracker Stopwatch Support Android 2.2 - Android 4.1 (NOT supports iphone) (Black) 100% Brand New and High Quality. Material: OLED Screen with Silicone Strap Application Function:Pedometer/Sleep Monitor/Bluetooth/Stopwatch/Ultra-long standby time/Low radiation/Chinese&English Rated capacity of Built-in Lithium battery: 70mAh Bluetooth Standard:2.1+EDR