The included a marine grade fuse and fuse holder that is connected inline with your main power wire will help with ultimate protection against the elements. The NXL Marine Amplifier series is exactly what the outdoors lover will need for their vehicle's audio that needs a strong versatile waterproof amplifier All our marine units have stable and reliable 4-layer PCB layouts, IP67 waterproof rating for power sports, has an ultra-compact size for easy installation The NXL Series of amps are one of our most efficient lines with great power output all while withstanding the elements Latest Digital Amplifier Design With SMC Technology