Apollo23-Quiet Aquarium Air Pump for Fish Tank with Plug Beautiful shape, ultra-quite, small size, light weight easy to carry, easily use. More than 800MAH rechargeable maintenace-free lead-acid batteries. Can be used for more than 800 350 times. With AC/DC function, can be used for AC 220V/50Hz, Can last for 8-10hrs when power cut off. Increases oxygen automatically when turned off, and it also increases the oxygen when transporting live aquatic products and seafood.