1The fan runs when plugged to the solar panel. And it can be used alone by plugged into computer USB port. 2When plugged to the solar panel, how the fan works depends on the sunlight. When the sunlight is strong, the fan works fast. When the sunshine is not strong enough, the fan may work low or even does not work. 3There is no rechargeable battery in the fan. If you need the fan works at night, you can use a power bank. 4The solar panel can be used separately as a power bank to charge your mobile phone. 5Portable and lightweight, suitable for traveling, self-driving tour, camping, hiking and other kinds of outdoor activities. Features:The fan runs when plugged to the solar panel. And it can be used alone by plugged into computer USB port. When plugged to the solar panel, how the fan works depends on the sunlight. When the sunlight is strong, the fan works fast. When the sunshine is not strong enough, the fan may work low or even does not work. There is no rechargeable battery in the fan. If you need the fan works at night, you can use a power bank. The solar panel can be used separately as a power bank to charge your mobile phone. Portable and lightweight, suitable for traveling, self-driving tour, camping, hiking and other kinds of outdoor activities. Specifications:Condition: 100% Brand New and High QualityMaterial: IronColor: BlackFan Size: Approx. 22.5 x 24cm / 8.9 x 9.4inchSolar Panel: Approx. 21 x 16.5cm / 8.3 x 6.5inchWorking Voltage: 5VWorking Current: 0-865mAUSB: USB2.0Weight: Approx. 930gPackage Included:1 x 8inch USB Fan1 x Solar Panel