The rechargeable FleshPump uses an easy-to-operate automatic vacuum system to gently and gradually draw blood into the penis to help maximize the potential of your erection. The 7.4" x 3" transparent cylinder sports both imperial and metric measurements that allow you to track your progress, while two buttons located on the base provide easy control of the pump and release functions. The FleshPump comes with a USB charging cable and a soft, SuperSkin donut sleeve.