HOME165IWS Electrol Projection Screen has aluminum housing with enamel coating is moisture resistant and made for wall & ceiling installations. Interchangeable 3-way wall switch or extended IR "Eye" sensor provides a choice of either an attached wall control box or streamlined casing. Maxwhite fiberglass backed material provides uniform flatness on the projection surface. Built-in 12-volt trigger synchronizes screen drop/rise with projectors power cycle. Tubular motor provides superior timing and lift capacity. Adjustable vertical limit switch regulates screen drop/rise settings.