The Luvpump® Smart Automatic Penis Pump features Manual Operation or Smart Function, allowing you to log the desired vacuum level and automatically complete the smart cycle with the touch of a button. Insert your penis into the silicone sleeve and press the button to discover 3 modes of exercise and intense, pleasurable suction sensations. The smart exercise function facilitates the completion of the desired 20-minute workout while you can watch TV or work. The pump's operation is very quiet, charges via USB cable, and is easy to disassemble for cleaning the cylinder and sleeve. Cleaning with antibacterial soap or toy cleaner is recommended before and after each use. Do not submerge the head in water and avoid using silicone lubricants. Pumping sessions increase blood flow to the penis area, which can stimulate tighter and longer-lasting erections. Pumping can also increase sensitivity, help with endurance training, and temporarily enlarge the size of your penis. A single 10-minute session can thicken and lengthen your penis for up to 24 hours. The detachable silicone sleeve provides maximum suction and comfort. Water-based lubricant is recommended!