Function:,Model: DFit D21,1.Model: D21 Smart Band,2.Memory size: 256k,3.Acceleration sensor: triaxial accelerometer,4.Strap: medical silicone,5.Display: 0.66OLED screen,6.Vibration motor: cylindrical vibration motor,7.Operation way: touch operation,8.Battery Capacity: 80mAh (Standby time will depend on the actual using situation.),9.Standby Time: About 3-5 days,10.Waterproof : IP65,11.Bluetooth version: Bluetooth 4.0,12.Rapid brush Metro BUS, can be customized set up the city,(Built-in NFC chip),13.Support System:Android phone(Android 4.3 or above and bluetooth 4.0), and iPhone (iOS 8.0 or above and bluetooth 4.0),The main function:,Heart rate monitor, caller ID, text messaging, micro-channel, vibration,Step count, distance, calorie consumption,Time display, sleep monitoring, camera, anti-lost reminder,Smart alarm clock, smart unlock,Sports information sharing,Firmware Upgrade,Sedentary reminder,Motion Tracking,,Precautions:,This product contains magnetic parts, has installed a pacemaker or implanted electronic devices or metal objects, please do not use this product.,When such wear, symptoms appear, please stop using the product immediately.,If you use sub-standard power charging will shorten battery life, and even damage the battery.,Our bracelet sealed process, anti-sweat, to meet the daily water, such as hand , etc., but does not support swimming, diving grade waterproof.,,Package include: ,1 * Bracelet,1 * Charging Cable,1 * User manual