LEXIN B4FM Motorcycle Bluetooth Headset User Manual

Introduction

Thank you for choosing the LEXIN B4FM Motorcycle Bluetooth 10-Way Conference Intercom. This headset features Bluetooth 5.0, hands-free calling, CVC/DSP noise reduction, USB-C fast charging, voice prompts, Siri/voice command support, navigation device connectivity, FM Radio, music playback, and universal intercom pairing with other manufacturers' devices. It supports music sharing and can connect up to 10 LX-B4FM devices with a theoretical range of 2 kilometers for 10 participants.

The LX-B4FM complies with Bluetooth Specification V5.0 and supports Headset Profile (HSP), Hands-Free Profile (HFP), and Advanced Audio Distribution Profile (A2DP). It is compatible with most Bluetooth headsets on the market.

Battery: The LX-B4FM has an 800mAh battery providing 15 hours of music playback or 15 hours of talk time. In standby mode, the battery life exceeds 1 week.

Function Priority: The headset operates in the following priority order: 1. Mobile phone, 2. Intercom, 3. Bluetooth stereo music, FM Radio/Navigation announcements. Lower priority functions are interrupted by higher priority functions (e.g., music is interrupted by intercom, and intercom is interrupted by an incoming phone call).

Safety Information: When riding a motorcycle, ensure that the use of helmet speakers complies with all local rules and regulations.

Package Contents

• B4FM Main Unit
• Ultra-thin 36mm HD Headphones
• Gooseneck Microphone / Button Microphone
• Holder for Gooseneck Microphone
• Mounting Bracket
• Clamp Plate
• ABS Pad for Clamp Plate
• 3M Adhesive Mount
• User Manual
• USB-C Charging Cable
• Pad for Headphones
• Allen Wrench & Screws *4
• Rubber Pad for Clamp Plate *2
• ABS Spacer for Detachable Main Unit

The package includes the main unit, headphones, microphones, various mounting options, charging cable, and user manual.

Installation Instructions

Mounting Bracket Installation

Option 1: Using Screws

1. Insert the mounting bracket between the inner padding and the outer shell of the helmet.
2. Secure the screws using the Allen wrench between the bracket and the clamp plate.
3. Depending on the helmet rim thickness, add 0-2 rubber pads (A & B) as recommended. If needed, use the longer screws for the ABS spacer (C).

Option 2: Using 3M Adhesive Mount

1. If not using screws and the clamp plate, attach the mount to the helmet using the 3M adhesive.
2. Peel off the protective film from the double-sided 3M tape and attach the mount to the helmet.
3. Press firmly for 15 seconds and allow the adhesive to cure for 24 hours.

Note: While the 3M adhesive mount is provided for convenience, LEXIN recommends using the screw-mounted bracket. The 3M adhesive mount is an option to be used at your own risk.

B4FM Main Unit Installation

1. To mount the main unit, slide it downwards onto the bracket until it clicks securely into the lower part of the bracket.
2. To remove the main unit from the base, use the provided ABS spacer. Insert the spacer between the main unit and the base, then push the main unit upwards to detach it.

Headphone Installation

Note: The speaker with the shorter cable is for the left ear, and the one with the longer cable is for the right ear to improve FM radio reception.

1. Attach the hook-and-loop fastener surface of the speaker to the helmet's inner lining.
2. Insert the speakers into the helmet's inner padding. If the helmet has deep ear pockets, use the provided headphone pads to position the speakers closer to your ears for better sound quality.
3. Tuck away any excess headphone cable between the helmet padding and shell.

Note: Additional headphone pads are included to adjust speaker thickness and positioning for optimal sound quality in helmets with deeper ear pockets.

Microphone Installation

Note: The gooseneck microphone and button microphone can be used interchangeably with full-face or open-face helmets. Choose the microphone that best suits your preference and helmet type.

Full-Face Helmet / Button Microphone:

1. Find a suitable area in the middle of the helmet's chin area and attach the hook-and-loop fastener surface.
2. Attach the button microphone to the fastener.
3. Connect the microphone to the headphone on the left side.

Open-Face Helmet / Gooseneck Microphone:

1. Attach the hook-and-loop fastener surface to the left inner side of the helmet. Attach the gooseneck microphone to it.
2. Adjust the microphone direction so the triangular mark points towards your mouth.
3. If necessary, use a microphone holder for secure mounting.

General Settings

Power On/Off: Press and hold the POWER button and the Intercom button simultaneously for 1 second to turn the device on or off. The LED will blink blue when powering on (with voice prompt "Power on") and red when powering off (with voice prompt "Power off").

Battery Charging: Connect the USB-C cable to the charging port on the main unit and plug it into a USB power source (e.g., phone charger, computer, power bank). The LED will turn red while charging and blue when fully charged. Full charging takes approximately 3 hours.

Low Battery Alert: When the battery level drops below 30%, an audible alert will sound every 5 minutes. The device will continue to operate for another 1-1.5 hours. At below 20% battery, the device will shut down.

Battery Status Notification: The current battery level is announced automatically upon powering on. In standby mode, press and hold the Volume Down button for 1 second to hear the battery status.

Battery Levels: 100%, 80%, 50%, 30%, Low.

Pairing the LX-B4FM with Other Bluetooth Devices

Pairing with a Mobile Phone:

1. While the device is off, press and hold the POWER button for approximately 5 seconds until the LED alternates between blue and red. The device is now in Bluetooth pairing mode.
2. On your mobile phone, search for Bluetooth devices. The headset will appear as "LX-B4FM".
3. Select "LX-B4FM" to connect. Enter "0000" as the PIN if prompted.
4. Confirm the connection on your mobile phone. A solid blue LED on the LX-B4FM indicates a successful connection.

Pairing with a Navigation Device:

1. While the device is off, press and hold the POWER button for 5 seconds until the LED alternates between red and blue. The device is in Bluetooth pairing mode.
2. Follow the pairing instructions on your navigation device to connect it with the LX-B4FM.

Note: After successful pairing, you can hear navigation announcements through the LX-B4FM.

Mobile Phone Calls

• Answering an Incoming Call: Press the POWER button to answer.
• Automatic Answering: The device will automatically answer an incoming call after 12 seconds.
• Activating/Deactivating Auto-Answer: While the device is on, press and hold the Volume Up button for 5 seconds. The blue LED will blink three times to indicate activation, or the red LED will blink three times to indicate deactivation.
• Ending a Call: Press the POWER button to end the call.
• Rejecting an Incoming Call: Double-press the POWER button to reject the call.
• Redialing Last Number: In standby mode, double-press the Volume Up button to redial the last number.
• Voice Assistant: After successful pairing with your phone and in standby mode, double-press the Volume Down button to activate Siri or S-Voice.

Volume and Music Control

Adjusting Volume

Press and hold the Volume Up or Volume Down button to adjust the volume. You will hear a beep when the maximum or minimum volume is reached.

Notes:

• Volume can be adjusted during music playback, FM radio, intercom calls, or phone calls.
• When listening to audio from your mobile phone, adjust the phone's volume as well for optimal loudness.
• A single press of the volume button adjusts the volume incrementally; holding it down adjusts it quickly.

Pause/Play

Press the POWER button to pause or play music.

Changing Tracks

• Double-press the Volume Up button to play the next track.
• Double-press the Volume Down button to play the previous track.

Music Sharing

The LX-B4FM (A) can share music with another LX-B4FM device (B). While device A is playing music, double-press the POWER button on device A to activate music sharing. If device B is in standby mode, double-press the POWER button on device B. Device B will search for device A and connect, then automatically play the shared music. This feature works between two devices only.

Stopping Music Sharing: While in music sharing mode, double-press the POWER button to disable the feature.

Intercom Pairing

The LX-B4FM supports full-duplex and group conversations. Intercom mode includes 4-way and group conversations, supporting up to 10 participants.

Note: It is recommended to delete existing connections before pairing. To delete connections, press and hold both Volume Up and Volume Down buttons simultaneously until the LED blinks red rapidly.

4-Way Intercom Pairing:

1. Pair the first and second devices by pressing and holding the Intercom button on both devices for 1 second until the LEDs blink red and blue. The voice prompt "Pairing" will be heard.
2. Pair the third device with the second device by pressing and holding the Intercom button and Volume Down button on both devices for 1 second until the LEDs blink red and blue.
3. Pair the fourth device with the third device using the same method.
4. Click the Intercom button on any device to search. The blue LED will blink rapidly. After successful pairing, the blue LEDs on all devices will blink slowly.

Starting an Intercom Conversation: After successful pairing, press the Intercom button on any device to start the conversation. The LEDs will blink blue and red simultaneously. Press the POWER button to disconnect the current intercom conversation. Press the Intercom button again to resume.

Note: If any device disconnects, the intercom group will split. Pressing the Intercom button on the disconnected device will reconnect the two independent groups.

Group Conversation Pairing (5+ Participants):

By default, the device operates in 4-way conversation mode. To activate group conversation mode for 5 or more participants, press and hold the POWER button for 8 seconds in standby mode until you hear a beep and the red LED blinks rapidly. This indicates the device has switched to group conversation pairing mode. This setting is not remembered; the device will revert to 4-way conversation mode upon next startup. To re-enter group conversation mode, repeat the process.

Note: Each LX-B4FM can be paired with a maximum of two other LX-B4FM devices (one before and one after) for group conversations. For example, after pairing the third device with the second and the fourth device with the third, there is no channel for the third device to connect to more devices.

Deleting Existing Intercom Connections: Press and hold the Volume Up and Volume Down buttons simultaneously for 1 second until the red LED blinks to clear all existing intercom connections.

Universal Pairing

Connecting with Headsets from Other Manufacturers

1. In standby mode, press and hold the Intercom button on the LX-B4FM for 1 second until the LED alternates between red and blue.
2. Turn on the other manufacturer's headset and set it to pairing mode.
3. Click the Intercom button on the LX-B4FM. The blue LED will blink rapidly. After successful connection, the blue LED will blink slowly.
4. After pairing, press and hold both the Volume Up and Volume Down buttons on the LX-B4FM simultaneously to start an intercom conversation.
5. In intercom mode, press the POWER button on the LX-B4FM to end the conversation.

FM Radio

Powering On/Off

• To turn on FM Radio: Press and hold the POWER button for 1 second.
• To turn off FM Radio: While FM Radio is on, press and hold the POWER button for 1 second.

Searching for FM Stations

• Scan Down: Double-press the Volume Up button. The device will tune to the next station downwards after the voice prompt.
• Scan Up: Double-press the Volume Down button. The device will tune to the next station upwards after the voice prompt.

Saving FM Stations

While in FM Radio mode, double-press the POWER button to save the current station. A beep will confirm the save. The device can store up to 6 stations. Once full, new stations will overwrite the oldest saved ones.

Playing Saved Stations

While in FM Radio mode, press the POWER button to cycle through the saved stations.

Contact Information

Lexin Electronics Inc.

Phone: 1-800-380-8248

Website: www.lexin-moto.com

Backed by a 2-Year Warranty.

For technical support: tech@lexinmotorcycle.com

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