BOSS Audio MC440B Motorcycle Speaker System &ndash; Bluetooth, Weatherproof Speakers / Amplifier, Two 3 Inch Speakers, One 2 Channel Amplifier, One Volume Control, Use With ATV/Motorcycle/12 Volt Vehicles BLUETOOTH: Play and control a vast library of your favorite music using your smartphone or MP3 device, plus plug into apps like Spotify and Pandora wirelessly. All possible via the 2 channel Bluetooth amplifier AMPLIFIER: A Bluetooth 2 channel, compact, weatherproof, class A/B amplifier is included. It has been sealed with the latest weatherproofing techniques to protect against a rainy forecast. Use the 3.5 mm Aux input for even more choices SPEAKERS: Also included are are two 3-inch chrome/black full range speakers. The adjustable brackets will fit handlebars from ranging from .75 to 1.25 VOLUME CONTROL: A convenient inline volume control (attached to the amplifier) can be installed in a place of your choosing, making sure that when the need hits so will your tunes. DIMENSIONS: Amplifier  3.5 x 3 x 1.5. Speakers  4.5 x 1.5 x 3 WARRANTY: BOSS Audio Systems Provides a Powerful 3 Year Platinum Online Dealer Warranty So Long As The Purchase Is Made Through Amazon Dot Com