Lexin LX-B4FM Motorcycle Bluetooth Intercom

1. Introduction

Thank you for choosing the Lexin LX-B4FM 4-Way Motorcycle Conference Bluetooth Intercom. This product offers a maximum bidirectional simultaneous bike-to-bike intercom transmission range of 1600 meters, includes wireless stereo Bluetooth headphones, and is designed for installation in most open-face, modular, and full-face helmets.

With the LX-B4FM, you can enjoy hands-free Bluetooth mobile phone calls, listen to stereo music, or receive GPS navigation voice instructions. It also enables wireless intercom conversations for rider-to-rider or rider-to-passenger communication within a 1600-meter range when up to four units are connected.

The LX-B4FM is compatible with Bluetooth v3.0 specifications and supports the following profiles: Headset Profile (HSP), Hands-Free Profile (HFP), and Advanced Audio Distribution Profile (A2DP). It supports universal pairing with most Bluetooth headsets on the market. Users can activate Siri or S-Voice on the main unit for voice dialing and other voice commands. An FM radio tuner is built into the main unit for station searching.

The high-fidelity, non-transmissive, ultra-slim helmet speakers provide superior audio fidelity. The headset also offers excellent ambient noise and wind noise reduction with its miniature boom microphone.

The main unit is powered by a rechargeable lithium-ion/polymer battery, providing 10-15 hours of active use on a full charge. Standby time is over a week. Please read this User Manual carefully before using this product.

Intercom Modes:

• Rider-to-Rider Intercom (Simultaneous Bidirectional Transmission)
• Rider-to-Passenger Intercom (Simultaneous Bidirectional Transmission)

The system can connect to GPS devices and mobile phones via Bluetooth for calls and music playback.

2. Package Contents

The package includes:

• Main Unit LX-B4FM
• HD Stereo Speakers with interchangeable microphone for open-face or full-face helmets
• Microphone with button
• USB Charging Cable
• Clip Mount
• 3M Adhesive Mount

Unit Diagram:

• POWER/CALL Button: For power on/off and call handling.
• INTERCOM Button: For initiating and managing intercom conversations.
• VOLUME + / PREVIOUS TRACK Button: Adjusts volume and skips to the previous track.
• VOLUME - / NEXT TRACK Button: Adjusts volume and skips to the next track.
• CHARGING Port: For charging the unit.
• EARPHONE Port: For connecting the speakers.

3. Installation Instructions

3.1 Mounting the Unit

Clip Mount: Insert the clip mount between the inner padding and the outer shell of the helmet.

3M Adhesive Mount: If the clip mount is problematic, use the 3M adhesive mount. Peel off the protective backing and attach the mount to the helmet. Press and hold for 15 seconds and allow the adhesive to cure for 24 hours. Lexin recommends the clip mount and offers the 3M mount as an option at the user's own risk.

3.2 Installing the Microphone

Full-Face Helmets: Find a location on the left side of the nose area. Attach the button microphone to the Velcro cushion and connect it to the earphone connector.

Open-Face Helmets: Adjust the microphone direction so the triangular mark faces the user's mouth.

3.3 Installing the Speakers

Position the speakers in the cheek pads. Securely push the speakers and microphone against the Velcro cushions.

3.4 Cable Management

Tuck the wires into the gap between the helmet lining and the 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, which also improves FM radio reception.

3.5 Attaching the Main Unit

Slide the LX-B4FM main unit onto the mount until it is securely seated at the bottom of the mount.

3.6 Detaching the Main Unit

To detach the main unit, simply lift it off the mount.

4. General Operation Instructions

4A. Powering On/Off and Charging

• Powering On: Press and hold the POWER button for about three seconds. The LED will flash blue. A voice prompt will announce the current battery level.
• Powering Off: Press and hold the POWER button for about three seconds. The blue LED will turn red and then turn off.
• Charging: Connect the micro USB cable to the USB port. The LED turns red during charging and blue when the unit is fully charged. Full charging takes approximately 2.5 hours.
• Low Battery Alert: When the main unit's battery level drops below 20%, the LED will flash red, and an alarm sound will occur every five minutes until the issue is resolved.

4B. Pairing LX-B4FM with a Bluetooth Device

Before using the LX-B4FM headset with a Bluetooth device for the first time, pairing is necessary. It can be paired with mobile phones, audio devices (like MP3 players or GPS units), and other Lexin Bluetooth headsets. This pairing operation needs to be done only once for each Bluetooth device. The headset will remain paired with each device and will automatically reconnect to paired devices when they are within range.

4B.1 Pairing a Mobile Phone

1. With the unit turned off, press and hold the POWER button for about 6 seconds until the LED flashes red and blue alternately.
2. Search for Bluetooth devices on your mobile phone. The headset will be listed as "LX-B4FM".
3. Enter "0000" as the PIN if required.
4. Your mobile phone will confirm that pairing is complete. The blue LED will flash after connection.

4B.2 Pairing a Bluetooth Stereo Adapter

1. Turn on the audio source and prepare the Bluetooth Stereo Adapter for pairing.
2. Put the LX-B4FM main unit into Bluetooth pairing mode (refer to the steps above).
3. Turn on or connect the Bluetooth Stereo Adapter.
4. The audio source will automatically start playing through the LX-B4FM main unit once pairing is complete.

4B.3 Pairing Bluetooth GPS Navigation

1. The pairing procedure is the same as "Pairing Mobile Phone".
2. For details, refer to the Bluetooth GPS navigation manual.
3. You can listen to Bluetooth voice instructions from the GPS navigation.

5. Controls and Functions

5.1 Volume and Music Control

Adjust the volume by pressing the Volume+ and Volume- buttons. A beep will sound when the volume reaches the maximum or minimum level.

Press the POWER button to play or pause music. While music is playing, press and hold the Volume- button to skip to the next track, and press and hold the Volume+ button to skip to the previous track.

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

5.2 Motorcycle Phone Calls - Incoming and Outgoing

5.2.1 Answering an Incoming Call:

The unit will automatically answer an incoming call after 12 seconds. Alternatively, press the POWER button to answer immediately.

Note: You can disable or enable the auto-answer function by pressing and holding both the POWER and INTERCOM buttons for 3 seconds. The LED flashes red 3 times when disabled, or blue 3 times when enabled.

5.2.2 Rejecting an Incoming Call:

Press and hold the POWER button for two seconds.

5.2.3 Ending a Call:

Press the POWER button to end a call.

5.2.4 Voice Dialing:

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 mobile phone. Simply say the name from your phonebook to call.

5.2.5 Redialing the Last Called Number:

In standby mode, double-click the Volume+ button to redial the last called number.

Note: In some cases (e.g., due to strong RF interference or metal obstructions), the headset may disconnect from the mobile phone. Briefly press the POWER button to reconnect.

5.3 Bluetooth Intercom Conversation

5.3.1 Pairing with Other LX-B4FM Headsets for Intercom Conversation:

The LX-B4FM can be paired with up to four other LX-B4FM units for simultaneous bidirectional Bluetooth intercom conversations. Each scenario (two, three, or four intercoms) has a different pairing process. When more than two units are connected, there will be a 'Bridge Unit' and 'Terminal Units'. To maximize range, riders should remain in the same order as the units were connected.

Note: Before pairing units for communication, it is recommended to clear existing connections on the unit. To do this, press and hold the Volume+ and Volume- buttons together until the red LED flashes, clearing all previous connections.

1) Pairing Two LX-B4FM Headsets to Talk:

Step 1: Pair two LX-B4FM units: Power on both units and put them into pairing mode. Press and hold the INTERCOM button for two seconds until the red and blue LEDs on both units flash rapidly.

Click the INTERCOM button on either unit until the blue LED flashes rapidly on that unit. Once pairing is complete, the blue LEDs on both units will flash.

2) Starting a 3-Way Intercom Conversation:

Step 1: Pair Unit 1 with Unit 2: Power on Unit 1 (blue indicator) and Unit 2 (red indicator). Simultaneously press and hold the INTERCOM and V+ buttons on either unit for two seconds to enter channel 1 pairing mode, until the red and blue LEDs on both units flash.

Click the INTERCOM button on either unit until the blue LED flashes rapidly on that unit. Once pairing is complete, the blue LEDs on both units will flash.

Step 2: Pair Unit 2 with Unit 3: Power on Unit 3 (blue indicator). Simultaneously press and hold the INTERCOM and V- buttons on Unit 2 and Unit 3 for two seconds until the red and blue LEDs flash to enter channel 2 pairing mode.

Press the INTERCOM button on either unit until the blue LED flashes rapidly on that unit. Once pairing is complete, the blue LED will flash on both units.

Step 3: Start a 3-Way Intercom Conversation: After all three units are paired, Unit 2 (red indicator) will be the bridge unit. Click the INTERCOM button on Unit 1 or Unit 2 to connect the two units. Double-click the INTERCOM button on Unit 3 or Unit 2 to connect the two units. All three units will then be connected.

Note: During a conference intercom conversation, both blue and red LEDs may flash simultaneously on each unit.

4) Disconnecting the Intercom Conversation:

Use the INTERCOM button again to disconnect the intercom conversation.

4.1 Click the INTERCOM button on Unit 1 or Unit 2 to disconnect those two units, while Unit 2 and Unit 3 remain connected.

4.2 Double-click the INTERCOM button on Unit 3 or Unit 2 to disconnect those two units. All three units will then be disconnected.

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

3) Pairing Four LX-B4FM Headsets to Talk:

Step 1: Pair the two bridge units first: Power on Unit 2 (red indicator) and Unit 3 (red indicator), which will serve as bridge units. Simultaneously press and hold the INTERCOM and V- buttons on both units for two seconds until the red and blue LEDs flash to enter channel 2 pairing mode.

Press the INTERCOM button on either unit until the blue LED flashes rapidly on that unit. Once pairing is complete, the blue LED will flash on both units.

Step 2: Pair bridge units with terminal units: Power on Unit 1 (blue indicator). Simultaneously press and hold the INTERCOM and V+ buttons on both Unit 1 and Unit 2 for two seconds until the red and blue LEDs on both units flash to enter channel 1 pairing mode.

Press the INTERCOM button on either unit. The blue LED will flash rapidly on that unit. Once pairing is complete, the blue LED will flash on both units.

Power on Unit 4 (blue indicator). Simultaneously press and hold the INTERCOM and V+ buttons on Unit 3 and Unit 4 for two seconds until the red and blue LEDs flash on both units to enter channel 1 pairing mode.

Click the INTERCOM button on either unit. The blue LED will flash rapidly on that unit. Once pairing is complete, the blue LED will flash on both units.

Step 3: Start a 4-Way Intercom Conversation: After all four units are paired, Unit 2 (red indicator) and Unit 3 (red indicator) will be set as bridge units. Double-click the INTERCOM button on Unit 2 or Unit 3 to connect the two bridge units.

Click the INTERCOM button on Unit 1 or Unit 2 to connect the two units.

Click the INTERCOM button on Unit 4 or Unit 3 to connect the two units.

Note: During a conference intercom conversation, both blue and red LEDs may flash simultaneously on each unit.

4) Disconnecting the Intercom Conversation:

4.1 Double-click the INTERCOM button on Unit 2 or Unit 3 to disconnect the two bridge units. While remaining connected to the terminal units, Unit 2 remains connected to Unit 1, and Unit 3 remains connected to Unit 4.

4.2 Click the INTERCOM button on Unit 1 or Unit 2 to disconnect the two units.

4.3 Click the INTERCOM button on Unit 4 or Unit 3 to disconnect the two units.

Suggestions: To connect bridge units, double-click the INTERCOM button. To connect a bridge unit to a terminal unit, press the INTERCOM button once on the terminal units.

Note:

• A beep will sound when an intercom conversation starts. It may take a few seconds for the other unit to connect. Wait until both units are connected before speaking.
• If bridge units 2 and 3 disconnect, the entire group will disconnect.
• If terminal unit 1 or 4 disconnects, the other three remain connected.
• If a unit loses connection with another, the two units on the same channel remain connected. Follow the connection instructions above to reconnect the disconnected unit when it comes back within intercom range.
• If a rider is out of range during a conversation, there may be mute movement, and the intercom will eventually disconnect. In this case, the LX-B4FM will attempt to automatically reconnect the rider every eight seconds, indicated by two high beeps, until the connection is re-established. To stop the attempt, press the INTERCOM button.
• To ensure successful communication for four riders, it is recommended to connect the two bridge units (red indicator) first using the INTERCOM and Volume- buttons, then connect them to the paired terminal units (blue indicator) using the INTERCOM and Volume+ buttons. Since Unit 2 and Unit 3 act as the "bridge" in the chain, keep them within the expected intercom range for continuous communication.

Suggestions: To save battery power, disconnect the intercom units when not in use.

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

5.4 Universal Pairing:

To pair with other brands of intercom headsets, the pairing operation is the same as bidirectional intercom pairing. However, initiating an intercom conversation with other brands' headsets requires simultaneously pressing the Volume+ and Volume- buttons on your unit. To end the intercom, simply press the POWER button.

5.5 Stereo Music and FM Radio

You can listen to stereo music via Bluetooth or FM radio.

• Wireless Stereo Bluetooth: The Bluetooth audio device must be paired with the LX-B4FM following the Bluetooth Audio Device Pairing instructions in the previous section. The LX-B4FM supports A2DP, allowing remote control of music playback if the Bluetooth audio device also supports A2DP. Volume control and play/pause functions will work.
• Radio FM: Press and hold the Volume- button for two seconds to access FM radio mode. Double-click the Volume+ or Volume- button to scan for desired stations.

5.6 Function Priority

The LX-B4FM operates with the following function priority:

1. Mobile Phone (Highest Priority)
2. Intercom
3. Stereo Music, FM Radio (Lowest Priority)

A lower priority function will always be interrupted by a higher priority function. For example, stereo music will be interrupted by an intercom call, and an intercom conversation will be interrupted by an incoming call.

5.7 Reset

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

5.8 Battery Level Reminder

You can check the current battery level by pressing and holding the Volume+ button. A voice will announce the charge level. When the battery level is below 20%, an alarm will sound every 5 minutes.

Contact Information

Website: www.lexinmotorcycle.com

Email: tech@lexinmotorcycle.com

Phone: +1 (800) 380-8248