Green Air LT4-120 and LT8-240 Lighting Controllers 

Green Air LT4 Lighting Controllers are designed to operate high load lighting equipment. It consists of a premium quality precision synchronous clock motor and a high amperage switching circuit. 

Plug lighting equipment into outlet receptacles located on each side of controller. Turn clock dial to current time of day. AM and PM is indicated by colored ring on dial face.

Four 5-amp 240 Volt outlet receptacles. Each capable of powering up to 1000 watts of lighting equipment.

Choose either 120 volt (LT4-120) or 240 volt (LT4-240) model.

More info from the Manufacturer (PDF format - Lots of detail.)