Rev Pump Automatic Penis PumpPumping has never been so easy. This automatic penis pump creates a suction sensation that could lead to you having a bigger and stronger erection. This penis pump features three different levels of suction, each of which creates a vacuum that can improve blood flow into your penis. Simply slip inside the pump's opening and let this penis pump do the hard work. Product features: Automatic penis pump Three different levels Requires 3 x AAA batteries