This universal receiver is equipped with a potential free relay change over contact the supply voltage can amount to 12 till 24 v acdcselectable frequencies 43362 and 43422 mhz together with a special transmission protocol lead to an extremely trouble free control coverage up to 1000 m depending on places are possible a feedback signalreport is sent to the transmittor sht 12 c4 so that user can identify whether the receiver was reachable receiver is suitable for switch key and timer