Boss Audio MR800 2-channel MOSFET Bridgeable Marine Power Amplifierw/ Remote Subwoofer Level Control:All MR Series amplifiers feature a unique rubber sealing door which tightly seals all control panel openings when not in use. It also uses in-line weatherproof connectors for all input and output connections, which are run through grommeted openings in end panels.MR800 Marine Power Amplifier Features:MAX POWER 2 OHM: 400w x 2RMS POWER, 4 OHM: 125w x 2MAX BRIDGED POWER, 4 OHM: 800w x 1SIGNAL-TO-NOISE RATIO: >102 dBTHD: 0.01% DIMENSIONS: 8-3/4 L WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.