JL Audio MHD Marine Amplifier - Combining Single Cycle Control and R.I.P.S. power supply technologies, MHD amplifiers deliver world-class, full-range fidelity and high-power output from an incredibly small package. In the Box:; MHD amplifier; Power input plug; Speaker connection plug(s); Four mounting feet; 2.5 mm Allen wrench; 4 mm Allen wrench; Four machine screws; JL Audio badge; Exceeds International Standards for Salt Fog and UV Exposure; Single Cycle Control-Groundbreaking technology applies output correction more than 400,000 times per second to deliver exceptional audio quality with reduced current draw and heat.; R.I.P.S. Technology - Regulated, Intelligent Power Supply is a tightly controlled design that maintains full power output from 1.5 to 4 ohms per channel and at any supply voltage from 11 to 14.5 volts.; Advanced Rollback Protection-Innovative circuit design ensures that the amplifier will never shut down as a result of thermal overload and keeps the music playing, even under the most demanding conditions.; Manufacturer 3 Year Warranty;