[USB rechargeable and lasts up to 70 hours]: This aerator has a built-in rechargeable battery that provides up to 70 hours of operation. Compared to other battery-powered aquarium air pumps, this rechargeable feature eliminates the need to change batteries, and you can charge it with your laptop, wall charger or rechargeable battery, saving money and the environment. You can take the fish aquarium pump with you for outdoor fishing, fish transport and power failure. [2 operating modes and single or 2 outlets]: The continuous air supply of the aquarium air pump can provide a maximum of 3L * / min (one outlet), 2 * 3L / min (double outlet); interval air supply: run for 10 seconds, pause for 10 seconds, saves energy and increases the use time up to 70 hours. Super air volume: 28kpa drive high pressure nano gas disk to provide air circulation in the fish tank. [Automatic power on after power failure to save energy]: Can work through the house lighting system. When the power goes out, the backup battery works automatically. You can choose the automatic power supply system. When unplugged or shut down during use, the system will immediately switch to battery to ensure sufficient oxygen in the event of a power failure. Aquarium air pump rated power 2W, energy efficient, will not overheat during operation. [Aquarium Air Pump Rechargeable Wide Compatibility]: This battery powered air pump is suitable for freshwater and saltwater aquariums for all types of tanks with capacity from 19-200L (5-120 gal). Excellent emergency aquarium oxygen pump [Super quiet]: 30~40 decibel quiet operation for quiet aquariums. The aquarium air pump will not disturb your sleep during operation. Accessories include: #One outlet: 1 air pump + 1 air hose + 1 air stone + 1 data cable, or #Double outlet : 1 air pump + 2 air hoses + 1 air stone + 1 data cable.