LEXIN LX-B4FM Motorcycle 4-Way Conference Intercom

1. Introduction

Thank you for choosing the LX-B4FM Motorcycle 4-Way Bluetooth Conference Intercom. This product offers a 1600-meter bike-to-bike full-duplex intercom maximum range and includes Bluetooth stereo wireless helmet headset(s). It is designed for installation into most open face, modular, and full-face style helmets.

With the LX-B4FM, you can make hands-free calls on your Bluetooth mobile phone, listen to stereo music or voice instructions from GPS navigation, and activate wireless Intercom for rider-to-rider or rider-to-passenger conversations within a range of 1600 meters when four units are connected.

The LX-B4FM is compliant with Bluetooth Specification v3.0, supporting Headset Profile (HSP), Hands-Free Profile (HFP), and Advanced Audio Distribution Profile (A2DP). It supports universal pairing with most Bluetooth headsets. Users can activate Siri or S-Voice for voice dialing and commands. The integrated FM radio tuner allows for station scanning.

Superior audio fidelity is provided by high-fidelity, non-ported, ultra-slim helmet speakers. The headset also offers excellent wind and ambient noise reduction with its miniature boom microphone. The main unit is powered by a rechargeable lithium ion/polymer battery cell, providing 10-15 hours of active use on a full charge, with over a week of standby time. Please read this User Manual carefully before using the product.

2. Package Contents

LX-B4FM Main Unit
Stereo HD Speaker with Interchangeable Microphone for Open Face Helmet or Full Face Helmet
USB Cable
Clip Mounting Bracket
3M Tape Bracket
User Manual

How it Works

The LX-B4FM supports multiple communication modes:

Rider to rider intercom (Full duplex): Connects multiple riders for simultaneous two-way communication.
Rider to Passenger Intercom (Full duplex): Connects the rider and passenger on the same motorcycle.
Bluetooth Connectivity: Connects to a Bluetooth-enabled cell phone for calls and music playback (supports A2DP profile).
GPS Navigation: Receives voice instructions from GPS devices.

3. Installation Instructions

3.1 Helmet Mounting Bracket Installation

3.1.1 Clip Mounting Bracket: Insert the Clip Mounting Bracket between the internal padding and external shell of the helmet. The bracket is designed to clip securely onto the helmet edge.

3.1.2 3M Tape Bracket: If you encounter difficulties with the clip bracket, the 3M tape bracket can be used. Peel off the protective backing sheet of the 3M tape and adhere the bracket onto the helmet. Press firmly for 15 seconds and allow the adhesive to cure for 24 hours.

Note: While the 3M Tape mounting is provided for convenience, LEXIN recommends using the bracket mounting. The 3M Tape mounting is offered as an option at your own risk.

3.2 Microphone Placement

For full-face helmets, locate an area in the nose section, slightly to the left of center, to mount the button microphone. Attach the button microphone to the provided Velcro pad and connect it to the headset connector.

For open-face helmets, adjust the microphone's direction so that the triangular mark on the microphone points towards your mouth.

3.3 Speaker and Wire Placement

Place the speakers into the cheek pads of the helmet, ensuring they are firmly pressed against the Velcro pads. Tuck the wires into the gap between the helmet liner and shell.

Note: The speaker with the shorter wire is for the left ear, and the speaker with the longer wire is for the right ear. This arrangement can also help enhance FM radio reception.

3.5 Main Unit Mounting

Mount the LX-B4FM main unit onto the bracket. Slide the main unit down onto the bracket until it clicks firmly into the bottom portion.

3.6 Main Unit Removal

To remove the main unit from the bracket, push it upwards.

4. General Operation Instructions

4A. Powering On/Off and Charging

Power On: Press and hold the [Power Button] for approximately three seconds. The LED will blink blue. A voice announcement will indicate the expected battery life.
Power Off: Press and hold the [Power Button] for approximately three seconds. The blue LED will turn red and then turn off.
Charging: Plug the micro USB cable into the USB port. The LED will be red while charging and turn blue when fully charged. Charging takes about 2.5 hours.
Low Battery Alert: When the battery level drops below 20%, the LED will flash red, and a tone alert will sound every five minutes until the battery is recharged.

4B. Pairing the LX-B4FM with a Bluetooth Device

Pairing is required the first time you connect the LX-B4FM headset to a Bluetooth device. It can be paired with mobile phones, audio devices (MP3, GPS), and other LEXIN Bluetooth headsets. Once paired, the headset will automatically reconnect to devices within range.

Pairing a Mobile Phone:
1. Ensure the unit is powered off. Press and hold the [Power Button] for about 6 seconds until the LED alternates between red and blue.
2. On your mobile phone, search for Bluetooth devices. The headset will appear as “LX-B4FM”.
3. If prompted, enter PIN 0000.
4. Your mobile phone will confirm successful pairing, and the blue LED will blink.
Pairing a Stereo Bluetooth Adaptor:
1. Turn on the audio source and prepare the Stereo Bluetooth Adaptor for pairing.
2. Put the LX-B4FM main unit into Bluetooth pairing mode (as described above).
3. Turn on or plug in the Stereo Bluetooth Adaptor.
4. Audio will automatically play through the LX-B4FM upon successful pairing.
Pairing Bluetooth GPS Navigation:
1. Follow the same procedure as “Pairing a Mobile Phone”.
2. Refer to your Bluetooth GPS navigation manual for specific details.
3. You can listen to Bluetooth voice instructions from your GPS.

5. Controls and Functions

5.1 Volume and Music Control

Adjust volume using the [Volume +] and [Volume -] buttons. A beep indicates maximum or minimum volume levels.

Press the [Power Button] to play or pause music.

While playing music, press and hold the [Volume -] button to skip to the next track, and press and hold the [Volume +] button to go to the previous track.

Note: When streaming music from a smartphone, you may need to adjust the smartphone's volume as well for louder output.

5.2 Safe Mobile Phone Calls - Incoming and Outgoing

Answer incoming call: The unit automatically answers after 12 seconds, or you can press the [Power Button] immediately. Note: You can disable/enable this feature by pressing and holding both the [Power Button] and [Intercom Button] for 3 seconds (red flash for disabled, blue flash for enabled).
Reject incoming call: Press and hold the [Power Button] for two seconds.
End active phone call: Press the [Power Button].
Voice Dial: In standby mode, double-click the [Power Button] to activate Siri or S-Voice. A beep will sound, followed by a voice prompt from your phone. Speak the contact name to dial.
Last phone call number redial: In standby mode, double-click the [Volume + Button] to redial the last number.

Note: In environments with high-power RF radio interference or metal obstructions, the headset may disconnect from the mobile phone. Short-press the [Power Button] to reconnect.

5.3 Bluetooth Intercom Talk

The LX-B4FM supports full-duplex Bluetooth intercom talk for up to four units. Pairing procedures differ for 2, 3, and 4-unit configurations.

Note: Before riding, it is recommended to clear existing connections by pressing and holding the [Volume +] and [Volume -] buttons simultaneously until the red LED flashes.

1) Pairing two LX-B4FM headsets to talk

Step 1: Pairing two LX-B4FM units first: Power on both units. Press and hold the [Intercom Button] for two seconds until the red and blue LEDs flash quickly on each unit. Click the [Intercom Button] on either unit until its blue LED flashes quickly. Pairing is complete when the blue LED flashes on both units.
Step 2: Start an intercom talk: Click the [Intercom Button] on one unit. Wait 3-5 seconds for connection. In intercom mode, both blue and red LEDs blink simultaneously.
Step 3: Disconnect an intercom talk: Click the [Intercom Button] again to quit. The blue LED will flash on both units after disconnection.

2) Pairing three LX-B4FM headsets to talk

Tip: Mark units with different numbers and colors (red/blue) for clarity.

Step 1: Pairing unit one with unit two: Power on unit one (blue mark) and unit two (red mark). Simultaneously hold the [Intercom Button] and [Volume + Button] on both units for two seconds to enter pairing mode for channel 1 (red and blue LEDs flash). Click the [Intercom Button] on either unit until its blue LED flashes quickly. Pairing is complete when the blue LED blinks on both units.
Step 2: Pairing unit two with unit three: Power on unit three (blue mark). Simultaneously hold the [Intercom Button] and [Volume - Button] on both unit two and unit three for two seconds (red and blue LEDs flash) to enter pairing mode for channel 2. Press the [Intercom Button] on either unit until its blue LED flashes quickly. Pairing is complete when the blue LED blinks on both units.
Step 3: Start 3-way intercom talk: After pairing, unit two (red mark) acts as the bridge. Click the [Intercom Button] on unit one or unit two to connect those two units. Then, double-click the [Intercom Button] on unit three or unit two to connect the remaining units. All three units will be connected. Note: During conference intercom talk, both blue and red LEDs blink simultaneously on each unit.
Step 4: Disconnect the intercom talk: Click the [Intercom Button] on unit one or unit two to disconnect those two units. Alternatively, double-click the [Intercom Button] on unit three or unit two to disconnect those two units, which will disconnect all three units.

Important Note: A Bridge unit cannot be connected to a Bluetooth device (phone or GPS) while functioning as an Intercom Bridge.

3) Pairing four LX-B4FM headsets to talk

Tip: Mark units with different numbers and colors (red/blue) for clarity.

Step 1: Pairing the two bridge units first: Power on unit two (red mark) and unit three (red mark). They will act as bridge units. Simultaneously hold the [Intercom Button] and [Volume - Button] on both units for two seconds (red and blue LEDs flash) to enter pairing mode for Channel 2. Press the [Intercom Button] on either unit until its blue LED flashes quickly. Pairing is complete when the blue LED blinks on both units.
Step 2: Pairing the bridge units with end units:
- Power on unit one (blue mark). Simultaneously hold the [Intercom Button] and [Volume + Button] on both unit one and unit two for two seconds (red and blue LEDs flash) to enter pairing mode for Channel 1. Press the [Intercom Button] on either unit until its blue LED flashes quickly. Pairing is complete when the blue LED blinks on both units.
- Power on unit four (blue mark). Simultaneously hold the [Intercom Button] and [Volume + Button] on both unit three and unit four for two seconds (red and blue LEDs flash) to enter pairing mode for Channel 1. Click the [Intercom Button] on either unit until its blue LED flashes quickly. Pairing is complete when the blue LED blinks on both units.
Step 3: Start 4-way intercom talk: After all four units are paired, unit two and unit three (red marks) are bridge units. Double-click the [Intercom Button] on unit two or unit three to connect the two bridge units. Click the [Intercom Button] on unit one or unit two to connect those units. Click the [Intercom Button] on unit four or unit three to connect those units. Note: During conference intercom talk, both blue and red LEDs blink simultaneously on each unit.
Step 4: Disconnect the intercom talk: Double-click the [Intercom Button] on unit two or unit three to disconnect the bridge units. Unit two will remain connected to unit one, and unit three to unit four. Click the [Intercom Button] on unit one or unit two to disconnect those units. Click the [Intercom Button] on unit four or unit three to disconnect those units.

Tips: To connect Bridge units, double-click the [Intercom Button]. To connect a Bridge unit with an End unit, press the [Intercom Button] once on the end unit.

Note: A beep sound indicates the start of an intercom talk; connection may take a few seconds. If bridge units disconnect, the group disconnects. If an end unit disconnects, the other three remain connected. If a unit loses connection, reconnect it when back in range. If a rider goes out of range, the LX-B4FM will attempt reconnection every eight seconds (indicated by high-tone double beeps). Press the [Intercom Button] to stop reconnection attempts.

For four riders, it's suggested to pair bridge units (red) first using [Intercom Button] and [Volume - Button], then connect them to end units (blue) paired with [Intercom Button] and [Volume + Button]. Keep bridge units (two and three) within intercom range for continuous communication.

Tips: Disconnect intercom units when not in use to save battery.

Important: The Bridge unit cannot connect to a Bluetooth device (phone or GPS) while acting as an Intercom Bridge.

5.4 Universal Pairing

Pairing with other brand intercom headsets follows the same procedure as two-way intercom pairing. To initiate intercom talk with a different brand, press both [Volume +] and [Volume -] buttons simultaneously. To end the intercom, press the [Power Button].

5.5 Stereo Music and FM Radio

Listen to stereo music via Bluetooth or FM radio.

Bluetooth Wireless Stereo: Pair your Bluetooth audio device with the LX-B4FM following the Bluetooth Audio Device Pairing instructions. The LX-B4FM supports A2DP for remote music control, including volume and play/pause functions. Use [Volume +] or [Volume -] to adjust volume, and the [Power Button] to play/pause music.
FM Radio: Press and hold the [Volume - Button] for two seconds to enter FM radio mode. Double-click [Volume +] or [Volume -] to scan for stations.

5.6 Function Priority

The LX-B4FM prioritizes functions in the following order:

Mobile phone (highest)
Intercom
Bluetooth stereo music, FM radio (lowest)

Lower-priority functions are interrupted by higher-priority ones (e.g., music by intercom, intercom by incoming calls).

5.7 Reset

To clear previous pairings, press [Volume +] and [Volume -] buttons simultaneously until the LED flashes red.

5.8 Battery Life Prompt

Check current battery life by holding the [Volume + Button]. A voice will announce the charge level. A beep alert every 5 minutes indicates a battery level below 20%.

6. Maintenance and Care

Treat the LX-B4FM with care to maintain warranty. Avoid dusty or dirty environments, high heat, and extreme cold. Do not attempt to open the unit, drop, or knock it. Avoid harsh chemicals, solvents, or detergents. Do not paint the device.

These suggestions apply to the headset main unit, speaker-microphone clamp unit, and power charger.

7. Certification and Safety Approvals

FCC Compliance Statement

This device complies with Part 15 of the FCC Rules. Operation is subject to two conditions: it must not cause harmful interference, and it must accept any interference received. This equipment has been tested and complies with Class B digital device limits, designed to provide reasonable protection against harmful interference in residential installations. If interference occurs, try reorienting the antenna, increasing separation, using a different circuit, or consulting a technician.

FCC RF Exposure Statement

Antennas must be installed to provide at least 20 cm separation from all persons and must not be co-located or operated with any other antenna or transmitter.

FCC Caution

Unauthorized changes or modifications may void the user's authority to operate the equipment.

CE Declaration of Conformity

This product is CE marked according to the RandTTE Directive (99/5/EC) and complies with essential requirements and relevant provisions of Directive 1999/5/EC.

8. Warranty

LEXIN warrants this product against defects in materials and workmanship for one (1) year from the purchase date by the original consumer purchaser. This warranty is limited to repair or replacement at LEXIN's discretion and does not cover misuse, neglect, accidents, or use with non-LEXIN equipment.

Limited warranty service requires delivering the Product to LEXIN or an authorized distributor with proof of purchase. Customers are responsible for shipping costs and insurance.

9. Waiver and General Release

By using the Product, you waive substantial legal rights, including the right to sue. You irrevocably release and hold LEXIN harmless from any liability, loss, claim, or expense (including attorney's fees) arising from bodily injuries, harm, death, or damages to property resulting from the use of the Product under any circumstances.

You assume all risks associated with using the Product, including those arising from the negligence of others. You confirm you are physically capable, at least eighteen years old, and have not consumed alcohol or mind-altering substances that could affect alertness.

You acknowledge the inherent risks in using the Product in traffic, including injury, paralysis, or death, which may be caused by manufacturer negligence or other factors. You assume all responsibility for any losses or damages.

WARNING: Please check all local laws and regulations regarding the use of in-helmet speakers while operating motorized vehicles.

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