Wireless Mobile Microphone for handsfree communication.A Control box is connected to the mike plug of the radio and to a 12VDC source. To connect to your radio you might need a conversion cable. Non-directional High Performance. For many types of radios conversion cables are available. The second part is small box ( battery case including transmitter ) that is wired with the TX-RX control part. This part has a microphone and TX-RX Switch. The available conversion cables are mainly for HAM radio brands. Ofcourse it is possible, if you are a technician, to make your own conversion cable. Before using please read carefully the user manual and instructions, these are published on Servicedocs.com