When you need a long range transmitter to control your single output relay this will do the trick. The distance will vary but we have seen them used to launch model rockets. Parking garage gates and home security devices. If you go with one of our high quality receivers and need good transmitter we recommend this one or the TM1000-4 series. Just give us a call if you have any questions and we will gladly assist you in finding the right transmitter. This device works with the following Single Channel Relay.