Apply a generous amount of water-based lubricant and slide it down to the base of the penis to find a comfortable position for a harder and stronger erection. For increased constriction and stability, stretch the second ring over the scrotum. The bullet vibrator should be fully inserted into the silicone sleeve, and then the knob should be turned before use. Features Bullet vibrator with a single vibration pattern. Quiet motor. Body-safe silicone. Requires 1 AAA battery (not included). Dimensions: 13 cm x 3.5 cm