Features1.Powered by solar and work at both day and night2. Having intake and exhaust blades3. Air flow:900~1000 cu.ft./hour4. Water resistant, no-noise, safe and pollution free.5. To avoid heat arising and make the place comfortable.6. To prevent damp and make the area with fresh air.7. Easy installationApplicationsFor caravans, yacht, boats, green houses, RVs, trucks, offices, home conservation, garage, dog house, kitchens, loft, farmhouse, barn, building, telephone boxes, mobile toiletSpecificationOuter diameter: 218 mmInner diameter: 118 mmInstallation depth: 50 mmOuter height: 33 mmFan motor drive voltage: 2.4 V~3.8 VSwitch: IN-OFF-OUTBattery: AA 1.2 V 1800 mA x 2pcsOperation time: all dayPackage content1 set x screws1 x solar ventilation fan1 x installation manualHow to test when you received the solar vent fan?Without battery version: take the solar vent out under the sunlight and turn the switch to either IN or OUT and wait for few seconds, the solar vent will start working.With battery version: Turn the switch to IN or OUT see if it's function.Warm tips1.The solar ventilation fan without battery version only works on daytime with sunlight, if your place is always with rainy day or with no sunlight, we would suggest you order the one with battery.2.The solar vent fan is for small place such as yacht, boat, RV, trucks, dog house, vans, small greenhouse etc.. If your place is very big and wide then this vent may not be appropriate.3.We suggest to install the solar vent horizontally and on a flat surface.