Power up for bigger, thicker erections with the Doc Johnson OptiMALE Power Pump! Watch your growth through the large, clear vacuum cylinder, featuring a soft silicone sleeve for an air-tight seal, a stylish pressure gauge, and an easy-to-read measuring guide to monitor progress. The strong auto-pump action is easily delivered with just the push of a button, and a quick-release valve button allows for customizable pressure. The Power Pump helps draw blood flow to your penis for the ultimate erection, increasing your size and sexual satisfaction! Made of phthalate-free, body-safe materials. Requires 4 AA batteries. Powerful Penis Pump. Push-Button Control. Clear Vacuum Cylinder. Quick-release Air-valve Button. Soft Silicone Sleeve. Large Pressure Gauge. Made of Phthalate-free, Body-safe Material. Battery-operated; Requires 4 AA batteries. Total length: 12.70â  . Usable length: 9â  . Width/Diameter: 2.80â  . Circumference: 8.80â  . Multi-speed.