Very quiet, waterproof, innovative design, fully automated masturbation pump for one-handed use. The pump features 3 suction modes, and the control function can be locked. The intensity of the vibration increases the blood flow to the erectile body. Apart from enhancing erectile function, it can also be used for increasing penis size. It is easy to use, with a single button to control the addition or reduction of air. The sides are metric and the wall is completely transparent. It works simultaneously to provide the real suction effect and the deep swallowing experience. Cleaning: before and after each use, the ring should be removed from the cylinder and both washed with lukewarm soap and dish cleaner. The packaging also includes a penis ring. It is recommended to use water-based lubricant. The product is waterproof, but the head part should not be submerged in water.