Built heart rate monitor: Get precise heart rate information?? without having to wear a chest strap</br>By synchronization with the app "eryfit 2.0" app (for iOS 7.0 or later & Android 4.3 or higher. Download APP "Veryfit 2.0" Apple Store or Google Play) may file the motion tracker and sleep tracker by 1 year stored and analyzed will</br>Long battery life of only a charge up to one week</br>Multi-functions: heart rate monitor?? pedometer?? calorie measurement?? distance?? Sleep Monitor?? Call Reminder?? Anti-lost. Alarm?? blush to drink?? photo shots or sedentary</br>Life Waterproof: This fitness bracelet remains watertight throughout the life of the part obtained such as briefly hold under water (showering / washing hands)</br></br>Product Description</br></br>Product Type: Smart Bracelet<br /> Model: HR107<br /> Color: Black?? Blue?? Orange?? Purple?? Green<br /> APP OS: IOS7.1 & above Android4.4 & above<br /> Sensor: G-Sensor kx022-1020<br /> CPU chip: Nordic nRF51822<br /> HR sensor: Silicon labs Si1142<br /> Vibration: vibrate real time to remember<br /> Waterproof: life waterproof (anti-sweat?? rain?? water drops)<br /> Screen Size: 0.49 "Type: LED<br /> Bluetooth: Bluetooth 4.0 BLE Sync<br /> Battery: 70mAh Li-Polymer battery<br /> Standby time: 5-10 days<br /> Charging: 2 points Contact<br /> Charging time: 1 hour<br /> Case size: 40.9x20.0x12.5 mm<br /> Band: 270mm<br /> Weight: 22 g<br /> Main Function:<br /> RTC?? heart rate monitors?? step pedometer?? calorie burning value?? distance track?? Sleep Monitor?? call (Caller Name / Caller ID) remember remind alarm?? anti-lost?? camera remote control?? etc.</br><br/>http://www.amazon.com/gp/product/B01EFG4LJKK<br/>http://ww