High Quality 4 Inch Cooling Ventilation Fan USB Solar Panel Iron Fan, Suitable for Home Office Outdoor Travel Fishing | The fan runs when plugged into the solar panel; plugs into a computer USB port for stand-alone use. When the solar panel is plugged in, the way the fan works depends on the sunlight. When the sun is strong, the fan works very fast. When the sunlight is not strong enough, the fan may work low or not work. The fan has no rechargeable battery; If you need the fan to work at night, you can use a power bank. Solar panel power: 3W, 6V Panel size: 14.5cm x14.5cm Application: Charger for power bank, MP3 and electronic products. Features: Waterproof Mini Fan Size: 4 Inch Material: Iron Power Supply: USB Plug 5v USB Cable Length: 120cm Color: Black Package Contents: 1 x Solar Panel Iron Fan Only the above package contents, excluding other products. Note: Different lighting and monitors may cause the color of the item in the picture to be slightly different from the actual item. Measurement tolerance is +/- 1-3 cm.