Function: 9 Frequency Vibration Color: Black Size: 8.9 * 3.8 cm/3.5" * 1.4" Net Weight: 51 g/0.1 lb/1.7 oz Power: Lithium battery/3.7V/90mAh Working time: 60-120 minute Charging time: 60 minute Noise: <40 Decibel Material: ABS + Silicone Package: Color...