1) Before using the system, check the Radio units are displaying the same frequency settings and try them as “walkie talkies” to check for correct operation. Depending on which Intaride Radio you have purchased the headset input sockets are found on the right hand side of the radio. The radio inputs are protected by a rubber cover which can be easily pulled away. Connect the Harness, Headset & PTT together. Connect the harness to the Radio unit and press the PTT button. Observe the transmit indication on the radio to confirm proper operation. Hold the microphone to your lips, press the PTT button and speak firmly, a receiving radio should hear your voice.