DuoDuoShop 2x Vacuum Twist Rotary Cupping Set Nipple Enlargement NO-Pump Suction Enlarger (M) Rotary piston exhaust method replaces the traditional method of ignition exhaust, no worries burns,safe and secure, greatly facilitate the people to use, both for the hospital, but also for families Usually once a day or every other day, every 5-15 minutes (often those bubbles, the elderly and infirm and children 5-7 minutes is appropriate); 7-10 times for a course of treatment, rest 3-5 days after the next course of treatment,it can be flexible based on individual physical condition.