Hideaway Marine Source Unit The CMM-30BB is a high-performance, marine source unit designed specifically for concealed, out-of-the-way installations. Engineered without a traditional display screen, all control functionality of the CMM-30BB is accomplished via two connection types: NMEA 2000 Connection* - Control using your compatible NMEA 2000 multi-function display (MFD). Requires compatible NMEA 2000 entertainment protocols (PGN) and may require a software upgrade of connected MFD devices. Refer to your MFD's manufacturer for device compatibility info. REMOTE Connection* - Optional wired remote controllers using accessory controller cables and splitters (sold separately). Connect up to three controllers to the CMM-30BB, at up to 75 ft (23m) away (cumulative cable length). Equipped with a wide range of audio source options, the CMM-30BB features a global, digital AM/FM tuner with built-in NOAA weather radio (US only), SiriusXM-Ready (tuner, antenna, and subscription sold separately), Bluetooth audio streaming, a USB 2.0 input for playback from your USB storage device (with 2.1A charging) and an analog auxiliary input, all designed to deliver non-stop sound, no matter how choppy the seas may get. Built to exceed industry standards for salt fog/UV exposure and vibration (ASTM B117/D4329) Global, digital AM/FM tuner, plus NOAA weather radio (US only) SiriusXM-Ready (tuner, antenna, and subscription sold separately) Save up to 18 of your favorite tuner stations/channels Wireless Bluetooth audio streaming USB 2.0 input with 2.1A charging output One stereo pair of auxiliary inputs (2V RMS) NMEA 2000 Certified - MFD (Multi-Function Display) control functionality via existing vessel networks. Compatible MFDs include Garmin, Lowrance and Simrad (Refer to MFD manufacturer for device compatibility info.) Built-in Amplifier: 4 x 25W RMS at 4 Ohms 8-channel preamp (3.5V RMS) outputs (Zone 4 or subwoofer)