Malibu TDC Power PTST-30012 12V AC Low Voltage Transformer 300W, 3000-0300-30 300W 12V AC Low Voltage Transformer. Transformer Manufactured by TDC Power for Malibu Lighting. Come with built-in photo cell for auto turn on and turn off feature. Come with digital timer with dusk to dawn, on, and 1 thru 9 hourly increments to turn on at dawn and turn off at selected hr. UL Listed, Metal Housing, Very reliable power pack