Four relays, single pole double throw. Controlled by any of the CommBox control units, or via RS232. 

Four power-rated changeover relays.
May be used for controlling lights, screens, curtains etc.
Can perform power, low voltage or signal switching.
Standard DIN rail mounting enclosure.
IR or RS-232 controllable.
Commands for ON, OFF, Toggle and Momentary control.
Addressable. Up to 16 “Simple range” products can co-exist on the same system.
Internal power supply can power small control panels (e.g. Joey wallmount, door entry panel) and IR receivers.
Indicator LEDs display relay status.
Moulded power plug/socket (supplied) avoids accidental wrong connections and enhances safety.