[Rechargeable battery]This fish tank air pump uses a 6000mAh large-capacity rechargeable battery, which can provide up to 185 hours of working time. [Intelligent AC/DC automatic switching]This fish tank pump has built-in power-off protection and intelligent AC/DC use: AC can be used as a standard air pump, and automatically switches to DC when the power is off. [Wide range of uses]This fish tank air pump uses precision components, stepless air volume adjustment, multiple noise reduction, and isolation of motion noise. It can not only be used indoors, but also for outdoor fishing, emergency pumps during power outages in aquariums [LED digital tube displays power]This USB air pump is equipped with speed and air volume adjustment, which can clearly know the battery power and air pump mode. 1. The fish tank is powered off and standby, the noise level is very important (requires bedroom-level silence), the power is automatically turned on when the power is off, the real automatic start-up (the plug-in water pump does not work after the power is off, and the air pump automatically starts to add oxygen) is not a power-off switch (the plug-in water pump works, the air pump continues to work after the power is off, and the external power supply is switched to the built-in power supply). 2. Most of the so-called automatic start-up machines on the market can only be powered off. After the power is off, they must be turned on to achieve the effect of oxygenation. This oxygenation pump can be plugged in without turning on. It can be turned on after monitoring the power off. In combination with other oxygenation equipment, it can continuously add oxygen to the fish tank to the of the fish in the fish tank Colour:White Material:plastic Package Contents: 1 x oxygen pump 2 x air stones 2 x check valves1 x USB cable 1 x 3 meters hose Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.