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