Intermatic ML200RTW 200 Watt Low Voltage Lighting Transformer, with Ground Shield, Black 200-watt power pack Comes with 2 sets of trippers to help you program your lighting system Coverts 120-volt AC to 12-volt AC power Automatic multiple on/off timer with manual override switch Weather-resistant housing protects pack. For any further queries please contact Intermatic Customer service contact number @ 815-675-2321.