lexin 2pcs b4fm 10 riders motorcycle bluetooth headset with music sharing, helmet bluetooth intercom with noise cancellation/fm radio, universal communication systems for atv/dirt bike lexin the lexin lx-b4fm is a bluetooth v5.0 hifi stereo headset designed specifically for motorcycles. with the lx-b4fm, you can call hands-free on your bluetooth mobile phone, listen to the best hifi stereo music, fm radio or voice instructions of bluetooth enabled gps navigation units wirelessly, and have conference intercom conversations with up to 10 riders at an intercom range of 2000 meters.