Function:  9 Frequency Vibration Color: Black/Green Size: 9.8 * 4.1 cm/3.8" * 1.6" Net Weight: 34 g/0.07 lb/1.1 oz Power: Lithium battery/3.7V/90mAh Working time: 30-55 minute Charging time: 50 minute Noise: <40 Decibel Material: ABS + Silicone Package:...