【USB rechargeable】Built-in 2600mAh rechargeable lithium battery, divided into two power supply modes: when fully charged, the working time of continuous mode is up to 24 hours, and the working time of indirect mode is 36 hours. [Power outage response] When there is a power outage at home, the fish gas pump will automatically switch to the lithium battery power supply mode. After power-on, it will automatically switch to the power supply mode to charge the lithium battery. 【Aquarium Air Pump Dual Air Outlet】Double air outlet design, you can put two air stones in different positions of a fish tank to make the oxygen distribution more even. 【Easy to carry】Small fish tank pump, easy to carry, suitable for fish tank, outdoor fishing, fish transportation and power outages, etc. The fish tank aerator can be charged through laptops and mobile power sources, saving energy and protecting the environment. 【STRONG MATERIAL】Durable ASB plastic case with non-slip silicone cushioning feet at the