I picked up the 12V 2-channel version of this to control some 12V lights on a trailer.The electrical connections were difficult to make secure with 22AWG wire, they just didn't seem to get a good hold. I also had to trim some plastic on the outer housing to allow space for the input wires, it would have pinched the wires quite severely if used without modification.Other than some install issues, this worked really well. Response time from remote click to relay activation is very fast, a fraction of a second. Range is adequate, probably 50 ft with some obstructions. I managed to program the built in garage door opener of my vehicle with the frequency of the remote. Now I can just press a button in my vehicle and it will trigger the relay, without needing the remote, very convenient.Everything considered, it's really impressive that you can get a device like this for $20. Great value.