Water and salt can be a marine source unit's worst nightmare. Our CMS4 source unit is IP66 tested to provide you the very best water intrusion and salt protection in its class. It also meets or exceeds ASTM B117 (Salt fog exposure), ASTM D4329 (UV Exposure), and is even resistant to 3.0G of vibration! Besides its toughness, the CMS4 features large intuitive control buttons and two anti-slip knobs that make operation a breeze. Buttons positioned along the edges of the display controller's face enable quick, stress-free access to functions. Customizable multi-color illumination of the buttons and knobs allows you to select your favorite color, match your boats anesthetic, or even reflect your mood. With the CMS4 Black Box installed, you can control everything from the wired watertight controller. It's simple robust design maximizes reliability. The vibrant color display allows for simple functionality with enhanced durability that can resist the most harmful of elements. Frequency bands FM/AM/Weather Band FM Tuner with RDS Frequency Range: 87.9 ~ 107.9MHz (0.2MHz STEP) AM Tuner Frequency Range: North America 530 ~ 1710kHz (10kHz STEP) Weather Band NOAA Frequency Range 162.400MHz ～162.550MHz Channel 1 : 162.400MHz Channel 2 : 162.425MHz Channel 3 : 162.450MHz Channel 4 : 162.475MHz Channel 5 : 162.500MHz Channel 6 : 162.525MHz Channel 7 : 162.550MHz AUDIO Maximum Power Output 70W × 4 @ 2Ohm Built-In Amplifier High Pass Filter (Speaker / Lineout) Low Pass Filter (Subwoofer) GENERAL Black Box Dimensions (W × H × D) (mm) 249.6 x 192 x 61.5 Commander Dimensions (W × H) (mm) 152.5 x 102 Low Consumption Mode as Power Off YLess than 50mA when POWER=OFF Ingress Protection (IP) Rating Display Controller : IP66 Black Box : IPX5 Display Controller 3.5" TFT Display Display Glass Corning Gorilla Glass