ECO-WORTHY Solar Powered Attic Fan Solar Venting Stainless Steel Solar roof fan Vent Fully automatic operation powered by solar energy. Avoid heat build-up at an area being ventilated. Prevent mold, condensation, mildew, musty odors, damp, etc. Easy installation. One year limited warranty. A brillantly simple way to ventilate boats, caravans, green houses etc. Good for wall mount, Deck or Roof mount which need longer sleeve when install. Operates without wires, without any running cost. Solar vent is incorporated, which enable the vent to be recharged during the day time when the ventilation is in process. After sunset, the solar vent is continuous in operation by power until the solar power drain. In clear day, the vent being recharged can drive the motor up to the next day when sunrise and recharge it again. If unit is just under cloudy days which cause solar panel cannot produce enough solar electricity, then user have to wait for next clear days with full sunlight to give unit with enough solar power.