DAY&NIGHT 2000. 3 inch Stainless steel Day & Night 2000, Solar cells recharge, Ni-Cad battery for 24-hour operation, No wiring required, Whisper-quite fan operation, Complete with interchangeable intake and exhaust fan blades. High capacity battery operates vent for 48 hours without sunlight on a full charge. High impact ABS plastic construction. Snap-in installation is compatible with existing Nicro snap-in deck plates. Mounting hardware, interior trim ring and deck plate with cover included, 3 inch model offered. Dimensions: 8-3/4 inches diameter x 2 inches high. Comes complete with two fan blades, deck plate and cover, white plastic interior trim ring and mounting hardware.