The Erec-Tech battery-operated system (BOS) is a state-of-the-art technology and is one of the better battery operated vacuum systems available in the world. With more than adequate negative pressure and the touch of a button, you receive results immediately. In addition, we provide you with 2 penile sleeves when you order with us (exclusive to U&Me Time). Also please call us directly if you have any questions, as we want you to be successful with your Vacuum Therapy Pump.