Letsfit Fitness Tracker with Heart Rate Monitor, Slim Activity Tracker Watch, Pedometer Watch, Sleep Monitor, Step Counter, Calorie Counter, Waterproof Smart Band for Kids Women and Men

Notes: Requires iOS 7.1 no charging cable and dock needed. One full charge gives you up to 7 days of battery life. SPECIFICATIONS Model: ID115UHR Bluetooth Connection Range: 10 meters (32.8 ft.) MCU: Nordic nRF51822QFAC Heart Rate Sensor: Silicon labsSill42Suit for Wrist Size: 5.4 inch - 7.6 inch / 137 - 193 mm Battery Capacity and Battery Type: 45mAh Polymer Rechargeable Li Battery Charging Time: 1hour Working Time: about 5 days Product Weight: 0.63oz/18g Material: host: PC; bands: TPE Working Voltage: 3.7V Screen Size: 0.86" OLED screen