This Marine Metal Products Cool Bubbles 11-1/2 qt. Insulated Livewell pump maintains a constant water temperature to keep your bait alive, and a glass bead air diffuser provides essential dissolved oxygen. The styrofoam shell is removable for easy maintenance, and the stay-put lid maintains an open position for easy access. The livewell is light enough to carry, sturdy enough to sit on and can be permanently mounted on a boat. Two alkaline D cell batteries (not included) keep the pump running for up to 85 hours.