Eco-Friendly Energy: solar powered oxygen pump, no extra battery and plug needed. Environmentally friendly and economical. Backup Battery: Built-in 3.7V 1800mAh 18650 lithium battery to store power in the daytime to ensure the oxygen pump can work at night . Adjustable Angle: The angle of the solar panel can be adjusted to achieve more sufficient solar energy. The solar panel can be stuck in the ground or fixed to the wall. 3 modes of operation: Strong bubble / Soft bubble / Cycle on / off. Fully meet various occasions and needs. Multi-purpose: widely used to add fresh air to various aquariums, swimming pools, ponds, fish tanks.
