This Air Pump useful where electricity is not available on 24 Hours or frequently electricity blackout. Provide essential air oxygen when AC power supply not available. Application: Deep water aeration, Aeration during electricity blackout, and where air oxygen required on emergency basis. Air pump with built in battery 2 way exit. When the light goes out, the inbuilt storage battery will work automatically. Causing the fish to always have oxygen even if the power goes out or is used to move the fish which will continue to work for approximately 9 hours using the power of the battery stored in the device with LED lights indicating the battery status with a valve to adjust the air pressure - used as a main air pump when the power goes out, the pump will continue to work immediately. Prevent fish from lacking in oxygen, used as a backup pump in case of power failure, to transport fish. The air output can be adjusted according to the usage through inbuilt air regulator.