The MMR-5N2K is a wired remote designed to add auxiliary volume control to compatible MediaMaster source units. Outfitted with a NMEA 2000 Micro-C connector, the MMR-5N2K connects to a host MediaMaster source unit in two ways: Direct interface with a vessel's NMEA 2000 network using applicable NMEA 2000 cables and connectors (not included) Direct connection to single MediaMaster source unit using MMC-PN2K powered network cables (sold separately) to simulate an isolated, stand-alone NMEA 2000 network Engineered for real-world marine (and many outdoor) applications, its weatherproof (IPX7 rated) design is built to withstand the harshest environments. In the box Wired volume controller Mounting hardware Documentation Specifications Physical dimensions (Height) 2.35" (60 mm) Physical dimensions (Width) 2.35" (60 mm) Physical dimensions (Depth) 2.04" (52 mm) Control Surface Dust/Water Rating (when properly installed) IPX7 Warranty 3 years NMEA 2000® Len 2 (100 mA) Usb 2.0 ports 1 (micro-C connector)