Function: 2 * 9 Frequency Vibration Color: Black/Green Size: 21 * 5.4 cm/8.2  * 2.1 inch Net Weight: 184 g/0.4 lb/6.5 oz Power: Lithium battery/3.7V/400mAh Material: ABS + Silicone Package: Color Box Further: Waterproof Package Size: 23.5*12.5*5.8 CM