This low voltage transformer is suitable for both indoor and outdoor use. With a built-in photo-cell for dusk to dawn operation, full ON mode or three AUTO settings (4, 6 and 8 hours). Input of 120-Volts, 60 Hz reduced to 12-volts with an output of 600-watt maximum. Automatic resetting thermal fuse in primary windings. Potted core and coil for cool, quiet operation. Low voltage transformer. Built-in photo-cell. Input of 120-Volts. Listed and UL approved.