Physical Dimensions Without Bracket: 3.94" x 3.94" x 1.57" (100 x 100 x 40mm) Weight: 1.01 lb (460g) Water Rating: IPX7 Amplifier Class: Class-D CEA-2006 Power Rating: 20-watt RMS x 2 @ 14.4 V input - 4 ohm Installation iOS App Android App Amplify the moment with an Apollo? marine amplifier ? designed specifically for use with any Fusion DSP-enabled marine stereo and Fusion speakers. This efficient zone amplifier provides audio zone expansion for high-quality sound in more areas on the boat. With 20-watt RMS per channel (at 4 ohm) this 2 channel amplifier allows the addition of an extra pair of speakers on board. The Easy Tune feature automatically regulates audio settings for the best sound quality without manual adjustments (Requires setup using the Fusion-Link? app on a compatible smartphone). Features: RMS Power: 20-watt RMS per channel (at 4 ohm) allowing you the addition of an extra pair of speakers on board. Efficient Class-D Design: Uses less power listen to music for longer at higher volumes with less drain on the battery. Easy Tune Feature:Automatically adjusts audio settings for the best possible sound quality with no manual adjustments required (Requires setup using the Fusion-Link app on a compatible smartphone). Compact Design:The compact size of the zone amplifier makes it a versatile option for mounting on board. LED Indicator:Show issues with electrical currents and shorts as well as temperature. Less Total Harmonic Distortion:The amplifier is designed with minimal distortion and noise allowing for better quality audio. Ignition Protected:Intelligent electronic fuse prevents damage from over/under current temperature output short and other faults. Conformal Coated PCBs:The amplifier circuit board has been specially coated to provide enhanced protection from the marine elements. Powder Coated Aluminum Finish: Salt fog temperature vibration and UV tested with a modern aesthetic stylish design. Easy Installation: A mounting bracket is included in the box simply clip the amplifier in place for a clean finish.