Docooler Solar Power Panel Bank Charger Oxygenator Aerator Air Pump Oxygen Pool Pond USB solar panel battery charger for Mobile Phones, MP3, MP4, iPhone, Nokia, etc. Using solar panel absorb sunlight and then transfer solar energy into electricity. Environmental protection: No pullution, no noise, no radiation. Can be used for small to medium pond, pool, fish tank.Place it under the sun, it can keep your pond oxygenating. With compact design and built-in lithium battery, it is convenient to carry.