Christmas Light Timer! Malibu 600 Watt Power Pack with Sensor and Weather Shield for Low Voltage Landscape Lighting and Spotlight Outdoor Transformer 120V Input 12V Output Light Control Timing: Malibu transformers connect light sensors that sense light, transformers start automatically at dusk; set the time so that your landscape lights automatically turn on at dusk and automatically shuts off at dawn. Great for Christmas Lights or house or garage lights. Have manual!