 The microphone RC600 panel allows you to control the amplifiers JDM ZA‎-6600  Location to a map interface RR100 included‎.‎  The remote microphone allows calls with bells on 6 areas or general call‎.‎  With this model‎,‎ you have the option of remote messages from the DM100 digital player‎.‎  With a line of 100 meters‎,‎ it is possible to connect 6 RC600 desks in series‎.‎  With a line of 250 m‎,‎ only 3 units can be connected‎.‎  A priority setting‎,‎ and volume can be performed at the back of each unit‎.‎  An RCA AUX input lets you connect a CD player‎.‎