|Crystal. 12 volts. Has an elegant internal frame & installation using sandwich system, installs into 400 x 400mm openings & a roof depth of up to 85mm. With thermostat included Polar control the Turbo-Vent is a ventilation system made from high quality materials that are impact & UV-ray resistant. It changes & refreshes the air inside the vehicle in a matter of seconds thanks to the 12V DV variable speed motor with 10 blades, It is the only one with an innovative electronic circuit that allows a rapid, closed manually & the centre arm provides stability against wind even when travelling with the cover open.