Xotak Heart Rate Monitor Bluetooth Health Fitness Tracker and More, Smart Band for Smartphones - Black Apart from the above mentioned functions fitness band brings you the best in class products with great quality products.When we talk about quality we mean our products have a better chipsets and more memory, better display and a better touch screen to give you the best performance available for this segment of smart watches. Smart Band Functions.Some Additiona Feature of "M2 Health Fitness Smart Band"1. Heart Rate Monitor2. Sedentary reminder3. Calories4. Time5. Alarm6. Anti-lost7. Distance calculation8. Step Monitor10. Call Alert Pre-requisites for useSome Important Instruction1. Your mobile phone Bluetooth version must be Bluetooth 4.0 or higher2. IOS version must be iOS 7.1 or above3. Android version must be Android 4.3 or above Specifications HR sensor : silicon labs Si1142 Host weight : 7g Battery type : rechargeable Li battery Battery capacity : 40mAh Data sync: Bluetooth 4.0 Working temperature : -10c to 50c Waterproof : Not for swimming or diving Standby time : 15 days & above This product uses professional Bluetooth RF signal and custom algorithm, the accuracy can reach 100 % and above. Package Contents: 1 x Bluetooth Smart Bracelet 1 x User manual 1 x USB Charging Cable.