3 Working Modes: The solar air pump kit includes 3 different modes: high speed, low speed, slow speed (10 seconds On/Off) Energy Saving: The air bubble pump absorbs sunlight and transfers solar energy into electricity by panel, environmentally friendly. USB Charging: Not only can be powered by solar energy, it can also be charged by USB, for bad weather without sunshine. Compact and Portable: Compact size and light weight, easy to carry, especially for outdoor activities such as fishing. Scopes of Application: Widely used for adding oxygen to various aquariums, fish tanks, ponds. Product Description Specifications: 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 Maximum air flow: 0.9L/min Minimum air flow: 0.5L/min Battery type: 18650 lithium battery Battery voltage/capacity: 3.7V 3600mAH