About this item FCC certified. FCC ID: 2ASVO05B7CT200; Broadcast audio over your own FM station to car radios,walkmen or any device that can receive FM stations;your customers only need to tune to the FM station you selected Adjustable distance;max 1km/3280ft long range;transmitter can also be connected external mic equipment and used in wide place such as campus shopping mall radio;conference speech etc Line level stereo input;professional PLL modulation system;make transmitter work stable;can adjust the volume on your audio device and mic in the transmitter until you are satisfied with the sound quality Special 5 station presets design used simultaneously without interference as wireless FM transmitter receiver for guided tour language interpretation With earphone for better listening environment; lock switch to prevent accidental operation; lanyard can suspends gently around the neck for comfort › See more product details