Display：0.68'' OLED screen

Bluetooth：4.0

Standby time：5-8days 

Operation temperature：-20°C～+45°C,                            
Storage temperature：-40°C～+45°

Function：

•Working voltage：3.0V

•Time counting:0-9999

•Distance presence:0-99.9km (the metric system)

•Calorie consumption:0-9999

•Permanent presence: in 24-hour time system

•Heart Rate Monitor

•Photograph

•Sleeping quality checking

•Remind of long-time sitting

•Caller identification

•Data memorizing for seven days

•Ultra-low power consumption and shutdown in 5s automatically

•Bluetooth

•Clock

•Anti-lost

•Remind water drinking

works with Android and iOS app. rechargeable battery (USB charging cable)