Boss MCBK500 Black 600 Watt Motorcycle/ATV Speaker System with Built-in FM Tuner Speakers Powered By High Performance, 2 Channel, Compact, Weatherproof Class A/B Amplifier 3.5 mm Aux-In Compatible with Audio Output of iPod / iPhone, Smartphones and MP3 Players Included: Two 3 Inch Black Speakers, One 2 Channel Amplifier, One Multi-Function Remote Control, Adjustable Brackets Fit Handlebars from .75 to 1.25 Ideal for Motorcycles, ATV's, UTV's, Scooters, And Other 12 Volt Applications Speaker Dimensions: 4.8 x 4 x 6.1, Amplifier Dimensions: 5 x 1.5 x 3, Gift Box Weight: 5.2 3 Year Platinum Online Dealer Warranty