Aquatop Aquatic Supplies Aquarium Air Pump 2.5 L-Min Blue AC-DC-ONE

Works like a standard air pump but offers an ingenious design with integral back up battery power. In the event of a power outage this pump will automatically switch to battery back-up. An essential piece of aquarium equipment for aquarist of all levels. Includes airline and airstone. Batteries not included. L x W x H: 6 x 3.75 x 1.75