Front/Rear Speaker Kit with Amp Include 600-watt amp with front and rear speakers, Amplifier installs easily inside front fairing, No upgrades required to factory charging system, Features R.E.M.I.T. circuitry for excellent FM reception from a Class D amp, No adjustments on amp makes installation very simple, Includes Ultra Rear Harness 2120-0900, which allows radio fader to control front/rear levels, System is expandable to easily add additional amplifier for fairing lowers or saddlebag lids, Radio reflash is not required for stock (Non CVO) Ultra Classic Models, For CVO Models, please see 4405-0545