Notice： Dear friends, thank you very much for liking our products. The image you have chosen is the product you have received. please refer to the webpage instructions for details. All products are made of molds, so there is a slight error between each product. The error range of each product is 1-3mm. Product description:     Material: Non-toxic ABS,silicone    Weight: 470g-1300g.    Color: Clear.Red.Blue.    Size: as shown    Use schedule as belowHow the Water Pump works   TheWater Pumpfunctions by creating a vacuum seal against the pubic area of the user, enclosing the flaccid penis. When the pump is pusheddownwards against the body, the bellows compress and water is ejected from the end of the pump via the open valve. When released the bellowsexpand and the valve closes, creating a partial vacuum inside the pump. This causes the penis to expand and fill with blood, creating an erection.Re pumping increases the vacuum, and so increases the size of the erection.Machine Gun     The user controls the valve by rotating the valve cap clockwise to lock the valve and anticlockwise to unlock the valve. When the valve is lockedthe internal vacuum cannot be released. This position is used when pumping or using the handball pump. When unlocked the valve cap can bepressed inwards against the spring. This opens the valve and allows air or water back into the body of the pump, thereby partially or fully releasingthe vacuum.     The vacuum inWater Pumpis created by the elastic recoil strength of the bellows gaiter pump, so the user cannot exceed the safe partial vacuum levels allowed under European and USA medical regulations. Recommended Use     In order to obtain optimum benefit from theWater Pumpand to avoid inappropriate use which may cause discomfort, you are strongly advised tofollow the instructions as outlined below: BEFORE FIRST USE:Wash yourWater Pumpusing warm, clean soapy water and rinse thouroughly.     • Ensure your pubic area is reasonably well trimmed. This will facilitate the vacuum seal against the pelvic seat.     • A relaxation period of a few minutes in a warm shower or bath is required to allow the testicles to soften, allowing them to remain free from thesealing area thereby avoiding any discomfort.     • Apply only the minimum amount of vacuum pressure necessary to achieve an erection. Excessive vacuum pressure and over vigorous pumpingmay result in bruising or injury to the penis.     • To benefit the most in erection hardness and optimal blood flow, it is best to remove the device every 2-3 minutes and allow the penis to retract.Massage the penis in the flaccid state for 2 minutes, then re apply the device and repeat the process. You should do this a maximum of 3 timesin any 15 minute session.Machine Gun     • Do not use theWater Pumpfor more than 15 minutes in any period of 24 hours. Comparison of advantages of water pump and air pump：    The pressure created by the air is unstable and creates an uneven vacuum that can cause the penis to bend and bulge.     However the pressure created by the water is balanced and stable, and as the water drains, it creates an even vacuum around the penis and allows for expansion without damage such as bending and bulging. pump size: X5 pump：   1.96inch*7.48inch （Suitable for penile erection length less than 15cm） X7 pump：   1.96inch*8.66inch (Suitable for penis erection length greater than 15cm and less than 18cm) X9 pump：   2.56inch*9.84inch (Suitable for penis erection length greater than 18cm and less than 22cm)      Please allow a little measure error, thank you for your understanding and support. Privacy Guaranteed: Your privacy is the utmost importance to us. The default name on the package is " Office Supplies" " Price $5"(any other requirements, please send us a message), and with our discreet packaging you can shop in confidence, the only person who knows what's inside the package is you!     To protect your privacy, we will ship the product without our color package. Hope you can understand . Thank you.Machine Gun.