Features: Solar powered oxygen pump, no battery and plug, economical and environmentally friendly. Includes 2 soft hoses, 2 aeration stones and a connector. Built-in lithium battery 3,7 V 1800 mAh 18650 do energy storage, so that the oxygen pump also works at night. Easy do double the airflow with the included "Y" connector. 50dB silent oxygen pump. Suitable do outdoor aquarium, fish pond or fishing. Product operating mode: 1- Position 1: high speed (constant indicator glows green) 2- Position 2: low speed (constant indicator on in dark blue) 3- Position 3:Work for 10 seconds and turn off 10 seconds over and over again (fixed LED lights up bright blue)Material: ABS Solar panel: 2,5 W,Laminated PET Battery: 3,7V 1800 mAH Product Operating Voltage Range:3,0 V (4,25 V) Discharge protection voltage: 3,0 V; Overcharge protection voltage: 4,25 V; Max. Current: 450mA Noise: 60dB Waterproof: IP64 Min. Airflow: 0,6 l/min Operating time: Approx. 20 hours Oxygen hose length: 100 cm / 39,37 inch Wire length: 3 M/118 INCH Product size: Approx. 19,1 * 17 * 2,7 cm / 7,52 * 6,69 * 1,06 inch Product Weight: Approx. 533g / 18,82 oz Package Weight: Approx. It does not ma the need to provide oxygen to fish or plants throughout the day, thanks to which the pump works intermittently not only well for them, but also prolongs the life of the pump.