Encoders and decoders are designed to transfer the status of an input, such as a switch or contact closure, over a wireless link. Often address or ID information will be included for uniqueness and or security. An encoder registers the button press or contact closure, creates a packet and outputs the packet for transfer to a decoder. The decoder checks the received packet to make sure it was received correctly and is authorized to activate the decoder. If everything is good, the decoder replicates the states of the encoder inputs on its outputs. These outputs are used to control whatever circuitry is required for the application.