Function: 10 Frequency Vibration Color: Black Size:  S: 35.5 * 0.5 cm/14" * 0.2" (25 g/0.06 lb/0.88 oz) M: 11 * 0.5 cm/4.3" * 0.2" (31 g/0.07 lb/1.1 oz) Power: Lithium battery Material: ABS + Silicone Package: opp bag Further: Waterproof