BOSS Audio MC420B Bluetooth, All-Terrain, Weatherproof Speaker And Amplifier Sound System, Two 3 Inch Speakers, Bluetooth Amplifier, Inline Volume Control, Ideal For Motorcycles/ATV and 12 Volt Applications Bluetooth Audio Streaming (Play and control music and apps like Spotify/Pandora wirelessly Through the Bluetooth Remote Control) 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 Chrome Speakers, One 2 Channel Bluetooth Amplifier , One Inline Volume 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: 3.5 x 3 x 1.5, Gift Box Weight: 4.9 3 Year Platinum Online Dealer Warranty