Rockford Fosgate R1-HD4-9813 160 Watt RMS 4 Channel Motorcycle/Harley Amplifier and Complete Speaker System - Includes All Wiring and Mounting Hardware, Closed Loop Design Maximizes Output What's Included: . 4-ch. Class-A/B Amp. Four 5.25" Speakers. Amp Mounting Bracket. Power Harness. Input Harness. Output Harness. Screws. Zip Ties. Velcro Pad. Batwing Grille Badge Rockford Fosgate R1-HD4-9813 Prime 160 Watt 4-Channel Motorcycle System. Complete Motorcycle Amplifier and Speaker Package. Fits 1998-2013 Harley-Davidson factory 4-speaker systems. Pass-Thru output for system expansion. 2/4 channel input switch. Extruded aluminum heat-sink. Optimized EQ, crossover and gain. Three position output level control. Fan cooled. Short circuit protection. Thermal protection. Multiple mounting options. Includes all harnesses and hardware for full installation