Totally automatic! No pumping, no squeezing... just push the button and the motorized pump does the rest! Pistol grip controller with easy push button activation. Seamless, flanged, 3"/ 8 cm oversized cylinder with universal measurements. Automatic release button. Flexible non-crimping hose. Stretchy TPE (sleeve), ABS (cylinder and controller), PVC (hose). 4 AAA batteries. 8.25"x 3"/ 21 cm x 8 cm (cylinder).