Aquarium air pump runs on Built-in lithium batteries when it senses that electrical current is interrupted. It will switch from electric to battery operated automatically.
It continues to work about 15 hours after electrical current is interrupted, the Power will last about 30 hours if the air pump work uncontinuously, works for 10s and stops for 10s(PLS press the button "FenDuan" near the power button).
The Air Pump will keep operating when electrical power is out and provides continuous aeration of two different tanks, keep your fish alive.
Designed with dual output ports can provide oxygen to two fish tanks at the same time.
NOTE: If you put the oxygen air pump on a place that lower than the fish tank water level, Pls set up a backflow barrier.Pls Read instructions on the box before you started.
This air pump provides a constant supply of oxygen to your fish tank in case of an emergency power outage.