Our MirC Point to Point Ethernet Switching series is the ultimate in easy and reliable remote relay control. A contact closure in one location trigger the corresponding relay in another location on a married pair. No wires, no software, it just works.
This married pair can be located anywhere in the world as long as the network they are connected to have internet access. Additionally they can work on a LAN without internet access provided they are on the same network.
This contact closure can be a simple switch, or any sensor that outputs a contact closure such as some current sensors and most proximity sensors.