Wireless receiver (868 MHz Frequency) with relay outputs, compatible with all radio transmitters, RF interference monitoting. Power source: 16VAC, 20VA, compatible with MG 5000, MG 5050 and Spectra serie. Repeats signal from the peripherals. No repeats signal from the remote control. Not compatible with SP4000 and EVO serie. Box not included (to install in S-BOX and L-box).