Display screen: LED display screen Charge mode: USB Supply voltage: DC=5V Battery capacity: 50mAh Pedometer: G-sensor Step calculation precision: ±5% Number of step displayed: 39999 steps Operation atmospheric pressure:860hPa-1060hPa High sensitivity 3D acceleration sensor(seize the small movement, step calculation more accurate) Free transform for calculation(humanization design, one-time step calculation, as well as 24 hours step calculation,shift as you wish) Time/date(manual setting for the time/height/weight) calorie,distance(can check the motion informaiton in the bracelet) Motion data memory(Bracelet keeps the motion data for 24 hours, automatically by zero hour, intelligent and worry-saving) Silent alarm clock(can operate the setting on the bracelet, no complicated handle on the App) Timekeeping function(Use the bracelet to do the timekeeping, the motion/distance/time can be clearly seen) Bracelet is with the USB interface(Can be used once , very convenient) Li-polymer charging battery(Li-polymer lithium battery is , longer life span) Color: Black Material: Silicone Package Contents: 1 x Smart Bracelet Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.