The MRD-70 AM/FM/CD Receiver with its RD-44 Display unit are the base foundation for an expandable multi-zone audio system. Additional RD-44 Remote Displays (RT-20 Router required) are easily connected through a single watertight DIN type cable, and create audio zones with remote control of audio functions from their installed location (bridge, galley, berth, etc.). Installation of an MZ-100 auxilliary amplifier in a zone allows for additional independent audio sources to be played and controlled in that zone. As many as 4 audio zones can be set up. The RD-44 Displays include an intercom which will allow communication between stations. The unique mounting system for the waterproof display accommodates panel, pod or bracket mounting. AM/FM, CD and MP3 compatible Supports XM (With IXM-10 Module) Maximum output: 45W per channel (4 channels) Water-resistant design withstands heavy splashing and waves (Front panel IP65) 2 auxiliary inputs; 1 auxiliary output No-skip CD/MP3 with 10 sec. delay Available in black and gray Use of additional RD-44 controlled zones will also require purchase of an RT-20 Router Zones with independent audio sources will require an MZ-100 Digital Amplifier