High airflow of up to 0.9 l/min. 100 tilting solar panel with easy-to-adjust angle to absorb maximum solar energy. Frequently used to add oxygen to various aquariums, pools, and ponds. Particularly suitable in the event of a power failure. Increases the amount of oxygen available to fish. Built-in 2200mAh large capacity battery provides up to 20 hours of operation on a full charge. Note: When the battery is discharged or replaced, restart the pump only after charging the battery by plugging it into a USB outlet for 5 seconds or placing it in direct sunlight for a few seconds. Can be powered by solar energy and also recharged by direct current via its integrated input port. Rechargeable battery inside stores energy for night operation. Intelligent microcomputer control with chip ensures constant pressure, constant charging current, overload protection, and low power alarm.