Function: 2 * 9 Frequency Vibration Color: Black Size: 11.4 * 3.9 cm/4.4" * 1.5" Net Weight: 70.6 g/0.15 lb/2.5 oz Power: Lithium battery/3.7V/140mAh Working time: 60-90 minute Charging time: 90 minute Noise: <40 Decibel Material: ABS + Silicone Package:...