3 working modes: The air pump solar kit includes 3 different modes: high speed, low speed, low speed (10 seconds On / Off) Energy saving: the pump air bubble absorb sunlight and transfer solar energy into electricity by panel, eco-friendly. USB charging: not only can be powered by solar energy, it can also be charged by USB, for bad weather without sun. Compact and portable: compact size and light weight, easy to carry, especially for outdoor activities such as fishing. Fields of application: Widely used to add oxygen to various aquariums, fish tanks, ponds, ponds. Product Description Features: Type: Solar Air Pump Quantity: 1 pc Material: ABS Color: as shown Air pump type: DC micro air pump Rated voltage: 3.0V Bath sound: less than 60dB Solar panel: 0.9W Solar panel voltage: 5V Solar panel charging time: 25H USB charging time: 5H Speed Maximum airflow: 0.9L/min Minimum airflow: 0.5L/min Battery type: 18650 lithium battery Voltage / battery capacity: 3.7V 3600mAH Operating voltage range: 3.0V-4.25V Maximum working current: 150 + -10 MA (high speed); 75+-10MA (slow speed). Quiescent current: less than 500UA Discharging protection voltage: 3.0V Charging protection voltage Voltage: 4.25V Light Control: No Surpport Size: 15*4.7*3.5cm/5.9*1.85*1.38inch Net Weight: 400g / 14.11oz Packages: 1*solar air pump 2*air stone 2*water hose air