The Rxm-f3 has a conformal coating on its PCB (printed circuit board) in this coating protects the amplifier from the elements of the ocean. If water gets sprayed on the amplifier you will not have to worry. The exterior Screws are made of stainless steel to better withstand the elements. This amplifier is Rockville Rxm-f3 1600 Watt peak/800W RMS marine class D mono block amplifier rams power ratings: .....800 Watts (4 x 200 watts RMS) @ 2 ohms .....800 Watts (2 x 400 watts RMS) @ 4 ohm Bridged>.....500 Watts (4 x 125 watts RMS) @ 4 ohms peak power: .....1600 Watts (2 x 800 @ 2 ohms or 1 x 1600 @ 4 ohms) high-speed MOSFET power supply studio-grade bipolar output stage transistors fully adjustable 12Db/ Octave Crossover with differential circuitry ch3 & CH4 low pass 50Hz - 3khz ch3 & CH4 high pass 15Hz - 1khz ch1 & CH2 high pass 50Hz - 300Hz, 500Hz - 3Khz (x10) crossover band-pass control 4 ohm mono bridgeable Channel mixed-mono capable full ice-controlled protection circuitry mute and delay soft start system high level input with smart auto turn-on full ice-controlled protection circuitry CH/ 4 CH Input mode switch race preamp line output ulna Brand audiophile capacitors Volt preamp circuitry status mode LED indicator damping factor: > 200 @ 100hz three 20 amp maximum fuses dimensions: ( w x H x L ) 8.6˝ x 2˝ x 13.7˝