We chose to switch to this Aquatop version of the pump from the Marina version for one major reason. This pump is a true battery back up, meaning you can install 2 D sized batteries in it and also plug it into a wall outlet. The pump will run from your homes electricity but if for any reason power is cut off to the pump the battery power will kick in. No panicking to get home to hook the battery operated pump in, it's automatic. You gotta love when a piece of equipment takes care of you in emergencies!

The Aquatop AC/DC-One Battery Operated Air Pump provides auxiliary air when a main air source fails. It's a reliable back-up air source during a household AC power failure, and can also be used as a portable aerator for fish in transit. Comes with an air stone, 23" tubing and an AC power failure sensor. Uses two D cell batteries (Not Included).