1. This product uses solar charging, pure copper movement, high-quality lithium battery, and cycle life up to 500 times. It has the characteristics of small size, low noise, large gas volume and long service life. It can be used continuously for about 15-20 hours when fully charged. 2. The internal circuit adopts imported microcontroller intelligent control, with the characteristics of constant voltage and constant current charging, overcharge and overdischarge protection, and high safety factor. 3. Widely used for oxygenating fish in various ornamental fish, aquariums, fish farming enthusiasts, corporate aquariums and domestic fish farming. It is especially suitable for emergency oxygenation during power outages, as well as oxygenation functions for wild fishing and transportation of small quantities of aquatic products. Product parameters: AP005 Solar panel: 6V/2.5W Battery: 3.7V/1800mAh lithium battery. 500 times service life. Air pump rated voltage: 3.5V Air pump maximum current: