Yuboya Multi-functional Waterproof Sport Watch Alarm with Backlit Digital3D Calorie Wrist Pedometer Watch With High-grade PU Watchband, With 6 Mode-- Pedometer Mode; Stopwatch Mode; Date&Time Mode ; Accumulate Data Mode; Alarm Mode; Data Memory Mode (BLUE) With waterproof function, it can be can used in rainy days With backlit function, the data can be read very clearly even at night Step count range :Can measure up to 99,999 steps or distances up to 999.99 miles; store data up to 30 days Time display, support 12/24 hour display format; exercise timer/alarm ,Track Step, Distance and Calculate Calories Burned Accurately Good Battery: CR2032 x 1pcs (around 1year , 10000steps/day); Step accuracy: +/-5%