Feature: 1. AC/DC oxygen pump, adopt pure copper movement and advanced single-chip intelligent control. 2. Built-in 3.7V 2200mAh lithium battery, charging via USB interface. 3. Constant voltage/current charging, over charge and over discharge conservation, low battery alarm. 4. Folding design to combine solar panel and pump in one, portable and low noise for use. 5. No wiring needed, ensuring a quick and easy installation. 6. Widely used for a variety of ornamental fish, aquarium, company aquarium, etc. 7. Built-in 3.7V 2200mAh lithium battery, charging via USB interface. Constant voltage/current charging, over charge and over discharge conservation, low battery alarm. 8. No wiring needed, ensuring a quick and easy installation. Widely used for a variety of ornamental fish, aquarium, company aquarium, etc. 9. Especially great for power outage emergency, as well as oxygen pump for wild fishing, small amounts of aquatic transport. 10. ?AC/DC oxygen pump, adopt pure copper movement and advanced single-chip intelligent control. 11. ?Built-in 3.7V 2200mAh lithium battery, charging via USB interface. 12. ?Constant voltage/current charging, over charge and over discharge conservation, low battery alarm. 13. ?Folding design to combine solar panel and pump in one, portable and low noise for use. 14. ?No wiring needed, ensuring a quick and easy installation. Specification: Solar Panel: 5V 1.4W Charging Input: DC 5V 1A Battery: Li ion battery 3.7V 2200mAh Air Pump: 3V 0.5W Min. Air Flow: 0.3L/min External Air Stone Dia.: 5.1mm Air Pipe Outlet Dia.: 4.4mm USB Cable Length: Approx. 100cm Working Power Range: 3.2V-4.2V 90mA Low Power Indication Voltage(flash in green): 3.3V Full Power Indication Voltage(red): 4.0V Over Charge conservation Voltage: 4.2V Working Time: Approx. 20 Hours with fully charged battery Product Size: 120 x 78 x 40mm / 4.72 x 3.1 x 1.57in. Package List: 1 x Oxygen Pump 1 x Air Pipe 2 x Air Stone 1 x USB Charging Cable 1 x User Manual (English)