CHECK AND RESET FCC Caution :To assure continued compliance, any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate this equipment. (Example - use only shielded interface cables when connecting to computer or peripheral devices). No Sound Ensure the AC adapter is fully inserted into the AC outlet and into the power connection input on the transmitter. Ensure the headphone ON/OFF switch is in its ON position.