Function: 10 Frequency Vibration Color: Black Inner Dia: 4.2 cm/1.6" Outer Dia: 7.3 cm/2.9" Net Weight: 79 g/0.17 lb/2.8 oz Power: Lithium battery Material: ABS + Silicone Package: OPP Bag Further: Waterproof Package Size: 13.5*10*6 CM