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LEXIN B4FM USER GUIDE. Function Introduction. Thank you for choosing the B4FM Motorcycle 10-Way Bluetooth Conference Intercom. Bluetooth 5.0. Page 10 Step 1. Pairing two LX-B4FM units first Power on both units, to enter paring mode, press and hold the Intercom button for two seconds until the red and You can examine LEXIN LX-B4FM Manuals and User Guides in PDF. View online or download 1 Manuals for LEXIN LX-B4FM. Besides, it's possible to examine eachThe B4FM is a Lexin favorite. Featuring excellent sound quality, digital noise cancellation,four-way intercom with up to a one mile range and FM radio. Before using the LX-B4FM Bluetooth headset with any Bluetooth device for the first time you need to pair them. It can be paired with mobile phones, audio