Function: 9 Frequency Vibration Color: Black Size: 8.8 * 5.3 cm/3.5" * 2.0" Net Weight: 64.5 g/0.14 lb/2.2 oz Power: Lithium battery/3.7V/90mAh Working time: 60-120 minute Charging time: 60 minute Noise: <40 Decibel Material: ABS + Silicone Package: Color...