Make sure that the transmitter and receiver are both powered on.
Ensure the transmitter’s batteries are installed correctly.
Check that the transmitter is not muted.
Confirm that the wireless receiver (box) adapter is correctly connected and plugged into an electrical outlet.
Make sure the audio output cables are securely connected to the wireless receiver.
Ensure that the receiver and transmitter (microphone) are in line of sight with one another.
Check the receiver and audio input device level controls.
If you have a frequency agile system, ensure that the transmitter and receiver are set to the same operating channel. If unsure, reset the channel by performing an IR set.