Operation: When the sun shines on the solar panel, connect the interface to start the fan. Up to 3200 rpm. When there is not enough sunlight, the fans run slowly or even stop. Easy to use: place the solar panel in a place where it can receive sunlight, install a fan, and connect it to use. Wiring-free, more flexible to use, battery-free products, more green, environmentally friendly and safer. Epoxy surface lamination increases durability. Wide Application: The solar panel fan kit has a wide range of applications and can be used in homes, RVs, greenhouses, utility rooms, pet houses, and more. Product Information: Open circuit voltage (Voc): 14V Maximum supply voltage (vmpp): 12v Short circuit current (isc): 1.3a Maximum power current (Impp): 1a Output: USB 5V DC5521 18V fan: double / single fan size: about 280 x 280 x 2.5mm Material: ABS colour: Black<br><br>Package Contents: 1 x Solar panel 1 x Exhaust fan / 2 x Solar panel 1 x Exhaust fan Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.