Waterproof Solar Swimming Pool Oxygenator - 2200mAh Air Pump - 100° Foldable Solar Panel - Energy Saving and Eco-Friendly

Powered by solar energy, no battery or electricity needed, energy saving and environmentally friendly. Made of high quality and durable ABS material. 100 degree foldable solar panel, easy to adjust a better angle to absorb solar energy. Built-in 2200mAh high capacity battery, it can work long time up to 20 hours once fully charged, meanwhile this air pump can be charged by DC power with USB cable. The internal circuit adopts imported single-chip microcomputer intelligent control, supports constant pressure and constant current charging, overcharge discharge protection and low electric alarm, safe to use.