Prostate Knock Stimulation Butt Plug Prostate Massager Function: 10 Frequency Vibration & Knocking Color: Black Size: 13.5 * 3 cm/5.3  * 1.1 inch Net Weight: 155 g/0.34 lb/5.4 oz Power: Lithium battery + 2AAA Material: ABS + Silicone Package: Color Box Further:...