Quadcast, 4-channel amplifier. Rated at 75 watts x 4 @ 2-ohms (300-watts total). Cast-aluminum 3D design provides exceptional heat management and thermal performance in high-heat climates. Revolutionary new shape fits seamlessly inside fairing for easy install. Features R.E.M.I.T. circuitry for excellent FM reception from a Class D amp. Made specifically to work best with factory H-D radio; no crossover, gain or EQ adjustments. No radio re-flash is required. Amplifier is specifically designed to work with bike's small factory charging system. Includes 100% plug-and-play wiring and all required hardware to complete the installation. Can easily link to Hogtunes REV 225-RM (PART #4405-0490) to create six channels of power (both amps inside fairing).