kspeaker motorcycle speakers bluetooth waterproof radio audio system built-in amplifier, 3 inch metal mp3 player, great for atv, scooter bike,12 volt vehicle, s7bl kspeaker <p>kspeaker ks-s7ch bluetooth waterproof sound system brings you enjoyable music.;</p ><p>the one-piece metal body and a pair of 3-inch full-range speakers can be installed on motorcycles, scooters or atvs (fit round tube 7/8 inch, 1 inch, 1.25 inch).;</p ><p>the bluetooth function allows you to connect to a music device to play your favorite music, and you can use the fm radio function to accompany you with messages whenever you want.<br></p >