Hydro Pump is an automatic water-air pump. The device is used to enlarge and stimulate the penis. Hydro Pump is equipped with a large, efficient suction pump. There are centimeters on the housing so you can control the results. Strong vacuum with hydraulic or air pressure. The pump has a safe pause program. It is made of high-quality materials that make its use pleasant, safe and long-lasting. The pump ring is extremely flexible and stretchable, so it perfectly adapts to the size of the penis. The set includes 3 silicone gaskets of different diameters. Material: silicone, ABS Type: automatic Charging time: 60 min Dimensions: 29.2 cm x 7.1 cm Diameter of rings without stretching: 2.5 cm; 3.2 cm ; 3.8 cm Power supply: rechargeable battery (USB cable included)