The penis pump is designed to generate vacuum suction, which promotes the blood filling the corpus cavernous repeatedly, thereby promoting the erection of the penis. 4 pressure levels are available for selection and can training penile erection function gradually. You can work your way up to the ost intense suction for your desired satisfaction. Adoring penis enlargement device is made of premium quality medical silicone with ABS, which is skin friendly. Easy to use pressure up/ pressure down/ release valve, easy operation with 3 buttons.