The moisture meter can quickly measure the moisture content of the grain. 1. With solar panel: Equipped with 13,5 x 11 cm solar panel to effectively transfer sunlight to electricity for power supply. 2. Good ventilation: This exhaust fan will help keep the air clean and eliminate unpleasant odors, creating a comfortable environment. 3. Heat Dissipation: It also plays an important role in pushing out hot air and pushing in cool air, suitable for heat dissipation. 4. Wide application: allows for wide use in chicken coops, greenhouses, sheds, pet houses, exhaust windows and so on. 5. Increased safety: With double metal protective mesh to prevent injury to individuals and animals, ensuring the normal operation of the fan blades. Specification: Item Type: Solar Panel Fan Product Material: Polysilicon Solar Panel Size: Approx. 13,5 x 11 cm / 5,31 x 4,33 inches Fan Size: Approx. 8 x 8 cm / 3,15 x 3,15 inch Operating Voltage: 6 V Maximum power: 2W Operating Current: 0-330MA Application: For ventilation, pet exhaust, chicken coop air flow, etc. Weight: Approx. 162 g / 5,71 oz List of packages: 1 x Solar Panel 1 x Fan Connected and used under the sun.