GARMIN MHD600/4-24V / MHD600424V (USED) MARINE AMPLIFIER, JL AUDIO, FULL-RANGE, CLASS D, 600 W, 4 CH, FOR USE WITH 24 V SYSTEMS. FACTORY WARRANTY MAY NOT APPLY. RADWELL 2-YEAR WARRANTY INCLUDED. radwell_international is a Division of Radwell International, Inc.