This 0.66 OLED Screen, standby more than 10 days, the wireless chip is NRF51822. Waterproof TPE Band, Activity Monitoring, Calorie Counter, Sleep Monitor, Alarm, Wireless, Pedometer, Battery rechargeable, Messages remind function, Heart Rate Function. Take photo after shaking the bracelet. It can show you the sleep quality trend chart when you are sleeping. 9 1/4" L x 15/16" W x 7/16" H
