1. Connected to the solar panel, the fan works; Plug it into your computer's USB port for standalone use. 2. Connected to a solar panel, the fan operates using sunlight. 3. As soon as the hot air is generated by the sun, the fan immediately rotates, dissipates the heat and ventilates in time. 4. The solar panel fan avoids the trouble of wiring, is safe and convenient, and is very suitable for outdoor use. 5. The power cord of the fan is long enough and does not contain a rechargeable battery. If you need to use it at night, you can add a power supply. Specifications Item Type: Solar Panel Fan Material: Polysilicon Wafer Solar Panel Output Interface: USB 2.0 Power Cord Length: Approx. 70cm / 27.6in Solar Panel Size: Approx. 136 x 110mm / 5.4 x 4.3in Package Contents: 1 x Solar Panel 1 x fan Note: Works only in direct sunlight, without power supply via the USB port.