This trendy-looking penis pump, the Pump Worx Auto VAC Kit, is a brilliant design from sex toy specialist Pipedream. With the push of a button, the powerful motor creates a strong vacuum inside the cylinder chamber, forcing your erection to expand its length and girth. The pressure can be read off the LED screen. Once you're done, simply press the red quick-release button to instantly relieve the pressure. The Pump Worx Auto VAC Kit is a high quality and functional penis pump. Required batteries: 4 x AA.