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). X 8.25x 3/ 21 cm x 8 cm (cylinder). Requires 4 AAA batteries (not included).