The Engel 2-Speed Aerator Pump runs strong on two D-Cell batteries. High speed works great when your cooler is full of bait. Then switch the pump down to low speed and conserve battery power later in the day. Plug into your car or boat's cigarette lighter using the handy 12V adapter to run the pump overnight and keep bait fresh for extended periods.Features3-Volt 2-Speed Electric Air PumpPower: 2 D-Cell Batteries (not included) or 12V DC Adapter - 9' (included)Adapter Output: 3V DCSilicone Air Hose (24") and Weighted Air Stone includedNote: For information about warranties and returns, please contact Engel.