Review on AQQA Aquarium Lithium Battery Air Pump - Multifunctional, Rechargeable, Energy-Saving, and Quiet Oxygen Pump with One/Dual Outlets, Air Stone, and 2600mAh Battery - Suitable for Indoors, Power Outages, and Fishing by Sarah Cannella

This garbage makes noise like a train. The power cables and overhead lines are so short that there is nowhere to lay them. Worst product. Power is also supplied via USB, only the plug is certified, which I strongly doubt. This can be dangerous and catch fire. The seller is based in China. I doubt there are rules. I'm not sure about the plastic and other details in it. Overall super cheap and thin. Made in China for $0.10 or even less.