besimple aquarium fish tank air pump quiet aerator oxygen pump with air stone 2 aa battery operated(not included) besimple <b>features</b><br> premium motor design, low noise operation, while providing stable oxygen supply bubbles. it will not disturb the normal activities of the fish when working.<br><br> <b>specification:</b><br> material: abs<br> working voltage: dc 3v<br> rated power: 0.5w<br> air flow: ≥0.5l/min (80cm)<br> tracheal length: 82cm<br> battery: 2 aa batteries (not included)<br> working time: more than 10 hours<br> applicable water volume: 80-100l (about 80cm fish tank)<br> size: 7 x 6.4 x 2cm /2.76 x 2.52 x 0.79 inch<br><br> <b>package list:</b><br> 1 x fish tank air pump