Function:7 Modes Vibration/MemoryMaterial:SiliconeColor:BlackPower:USB ChargingCharging Time:60 minutesBattery Life:40 minutesFurther:IPX5 WaterproofProduct Size:110x45mm/4.33x1.77 inchesRing Size:30mm/1.18 inchesPacking Size:165x110x60mm/6.5x4.33x2.36 inchesPacking:Color BoxPackaged Weight:0.2kg