LEXIN B4FM Motorcycle Bluetooth Intercom

Download User Manual Online

Access the user manual in various languages online:

• English, Spanish, German, Italian, French, Japanese: Visit www.lexin-moto.com, go to Support > User Manual, and select “B4FM”.
• Français: Pour obtenir un mode d'emploi en Anglais, Espagnol, Allemand, Italien, Français, Japonais en ligne... Accédez à www.lexin-moto.com et trouvez-les sur Support - User Manual, puis sélectionnez “B4FM”.
• Italiano: Per il Manuale Utente Online in Inglese, Spagnolo, Tedesco, Italiano, Francese Giapponese... Visita www.lexin-moto.com, vai su Support - User Manual, e seleziona “B4FM”.
• Deutsch: Online Bedienungsanweisung auf Englisch, Spanisch, Deutsch, Italienisch, Französisch, Japanisch usw., besuchen Sie www.lexin-moto.com gehen Sie zur Unterstützung - Bedienungsanweisung, dann wählen Sie “B4FM”.
• Español: Para el Manual del Usuario en Línea en Inglés, Español, Alemán, Italiano, Francés, Japonés... Visite www.lexin-moto.com, vaya al Soporte - Manual de Usuario, y seleccione “B4FM”.

Watch Instruction Video Online

Subscribe to our YouTube channel @lexinmoto to find "B4FM" instruction videos.

• English: Subscribe to our Youtube channel @lexinmoto, and find “B4FM” Instruction videos.
• Français: Suivez notre chaîne Youtube @lexinmoto, Et trouvez les vidéos “B4FM” Instruction.
• Italiano: Iscriviti al nostro canale Youtube @lexinmoto, e trova i video di “B4FM” Instruction.
• Deutsch: Abonnieren Sie unseren YouTube-Kanal @lexinmoto und suchen Sie das Video “B4FM” Instruction.
• Español: Regístrese nuestro Youtube channel @lexinmoto, y encuentre videos “B4FM” Instruction.

Function Introduction

Thank you for choosing the LEXIN B4FM motorcycle Bluetooth intercom.

Key Features:

• Bluetooth 5.0
• Hands-free calling
• Built-in CVC/DSP noise reduction
• Type-C USB fast charging
• Voice prompt support
• Siri and voice assistant support
• Universal pairing with other Bluetooth intercoms
• Navigation connection
• Music and radio playback
• Music sharing function
• Supports connection of up to 10 B4FM units, with a maximum connection range of 2km.

B4FM complies with the following Bluetooth 5.0 profiles (specifications for interoperability between Bluetooth devices): Audio Support Profile (HSP), Hands-free Profile (HFP), and High-Quality Stereo Audio Streaming Profile (A2DP). B4FM supports pairing with most Bluetooth headsets.

Battery:

The B4FM is equipped with an 800mAh battery, providing up to 15 hours of music playback and talk time, and over 7 days of standby time.

Function Priority:

The B4FM operates according to the following priority:

1. Mobile Phone
2. Intercom
3. Music / Radio / GPS

Note: Functions with lower priority may be limited when functions with higher priority are active. For example, music playback may be restricted when the intercom is active, and intercom function may be restricted when a call is received.

Warning:

Please strictly comply with domestic laws and regulations regarding the operation of helmet-integrated speakers while riding.

Package Contents

The package includes the following items:

• B4FM Main Unit
• 36mm HD Ultra-Slim Speakers
• Boom Microphone / Button Microphone
• Boom Microphone Holder
• Clamp Bracket
• Clamp Plate
• Additional Mounting Pad
• Adhesive Bracket (3M double-sided tape)
• User Manual
• Type-C USB Cable
• Speaker Pads
• Hex Wrench and 4 Screws
• Clamp Plate Rubber Pads
• Detachable Plate

Diagram Description: The diagram shows the B4FM main unit, speakers, microphones, various mounting brackets, cables, and pads. The main unit has buttons for power, volume up/down, and intercom, along with USB and Type-C ports. Speakers are slim and designed for helmet integration. Microphones are available in boom and button styles. Mounting options include clamp brackets and adhesive brackets.

Installation Guide

Mounting the Clamp Bracket on the Helmet

1. Using the Clamp Bracket: Attach the clamp bracket and clamp plate to the inside and outside of the helmet as shown in the diagram. Secure them using the two included hex screws and the hex wrench.
2. Note on Fit: Depending on the helmet's size and shape, additional rubber pads may be needed between the clamp plate and the helmet. Use the included extra rubber pads if necessary. If the helmet's lining requires a thicker bracket, additional pads can be attached to the existing pads as shown. Use the longer hex screws provided in this case.
3. Using the Adhesive Bracket: If the clamp bracket cannot be used, the adhesive bracket (with 3M double-sided tape) can be attached to the helmet. Peel off the protective film from the double-sided tape and press the bracket onto the helmet surface for 15 seconds. Allow it to cure for at least one hour before use for complete adhesion.
4. Note on Adhesive Bracket: While LEXIN provides an adhesive bracket for user convenience, the clamp bracket method using screws is recommended. The use of the adhesive bracket is at the user's own risk, and LEXIN is not responsible for any issues arising from its use.

Mounting the B4FM Unit onto the Bracket

Align the B4FM main unit with the bracket and slide it down until it clicks into place. To detach, insert the provided detachable plate between the bracket and the B4FM unit, then slide the unit upwards.

Installing the Speakers

Note: Ensure the shorter cable speaker is on the left and the longer cable speaker is on the right. Proper speaker placement is crucial for optimal radio reception.

1. Attach one side of the speaker's velcro pad inside the helmet.
2. Press the speaker firmly onto the velcro pad. If the helmet has deep ear pockets, use the included speaker pads to bring the speakers closer to your ears.
3. Tuck the speaker cables neatly between the helmet's inner lining and outer shell.
4. Note: Extra speaker pads are included for helmets with deep ear pockets. Attaching these pads to the speakers can increase their thickness, allowing for closer ear placement.

Installing the Microphone

Note: Depending on the helmet type (full-face or open-face), you can choose between the button microphone and the boom microphone for the best fit.

Full-Face Helmet - Button Microphone:

1. Locate the center of the helmet's chin area and attach half of the microphone's velcro pad as shown.
2. Attach the button microphone to the velcro pad.
3. Connect the microphone to the headphone connector on the left side.

Open-Face Helmet - Boom Microphone:

1. Attach half of the velcro pad to the underside of the microphone and the other half to the helmet's inner padding.
2. Adjust the microphone's position so the triangular indicator faces your mouth.
3. If necessary, use the boom microphone holder for additional stability.

Operation Guide

Buttons:

Up Button:

• Set auto-answer
• Volume Up
• Next Track
• Redial last number
• FM Radio Scan Up
• Clear Pairing (Press and hold Volume Up and Volume Down buttons simultaneously)

Power Button:

• Power On/Off
• Phone/Navigation Pairing
• Answer/End Call/Reject Call
• FM Radio On/Off
• End Intercom Session

Intercom Button:

• Enter Pairing Mode

Down Button:

• Volume Down
• Previous Track
• FM Radio Scan Down
• Check Battery Level
• Activate Phone Voice Assistant

Power On/Off:

Power On: Press and hold the Power button and Intercom button simultaneously for 1 second to turn on the device. The LED will turn blue, and a voice prompt will announce "Power on" and the battery level.

Power Off: Press and hold the Power button and Intercom button simultaneously for 1 second to turn off the device. The LED will turn red, and a voice prompt will announce "Power off."

Battery:

Charging: Connect a DC 5V charger (e.g., phone/laptop charger or power bank) to the Type-C port. The LED will be red while charging and turn blue when fully charged. Full charge takes approximately 3 hours.

Low Battery Warning: When the battery level drops below 30%, a voice alert will play every 5 minutes until the device turns off. The device can be used for approximately 1-1.5 hours after the warning. If the battery drops below 20%, the alarm will automatically stop.

Battery Level Check: Upon powering on, the device announces the current battery level. In standby mode, press and hold the Volume Down button for 1 second to hear the battery level announcement. Battery level is indicated in 5 stages: 100%, 80%, 50%, 30%, LOW.

Bluetooth Device Pairing:

Note: In group intercom mode, one LX-B4FM can connect to two other LX-B4FMs or one mobile phone. When Bluetooth is on, the device automatically connects to the last paired device. If no Bluetooth device is connected or in standby mode, press the Power button to connect to a Bluetooth device.

Phone Pairing:

1. With the device powered off, press and hold the Power button for 5 seconds until the LED flashes red and blue.
2. On your phone's Bluetooth settings, select "LX-B4FM". If prompted for a PIN, enter "0000".
3. Upon successful pairing, a voice prompt will say "Pairing complete."
4. Note: The LED will flash blue after pairing is complete.

Navigation Pairing:

1. With the device powered off, press and hold the Power button for 5 seconds until the LED flashes red and blue.
2. Follow your navigation device's pairing instructions.
3. Note: Once paired with navigation, you can hear voice guidance from the navigation device.

Volume/Music Control:

Volume Up/Down: Press and hold the Volume Up/Down buttons during music playback, calls, or radio use to adjust the volume.

Note: Volume can only be adjusted when music, FM radio, intercom, or call modes are active. On some phones, adjusting the phone's volume can further increase the audio output.

Track Control: Double-tap the Volume Up button to skip to the next track. Double-tap the Volume Down button to go to the previous track.

Play/Pause: Press the Power button once to pause music; press it again to resume playback.

Music Sharing:

One B4FM unit (A) can share music with another B4FM unit (B). While music is playing on unit A, double-tap the Power button to enter music sharing mode. Then, double-tap the Power button on unit B (which must be in standby mode) to connect with unit A. Once connected, the same music will play automatically on both units.

To stop music sharing: Double-tap the Power button on both units.

Calls:

Answer Call: Press the Power button to answer an incoming call.

Auto-Answer: The device will automatically answer calls within 12 seconds.

Enable/Disable Auto-Answer: With the device powered on, press and hold the Volume Up button for approximately 5 seconds. The LED will flash blue for 3 seconds to enable auto-answer. It will flash red for 3 seconds to disable it.

End Call: Press the Power button to end an active call.

Reject Call: Double-tap the Power button to reject an incoming call.

Redial:

In standby mode, double-tap the Up button to redial the last number.

Voice Assistant:

When your phone is connected, double-tap the Down button to activate voice assistants like Siri, Bixby, or Google Assistant.

FM Radio:

Turn On/Off: With the device on, press and hold the Power button for 1 second to turn the FM radio on or off.

Frequency Search: Double-tap the Volume Up button to scan for the next frequency. Double-tap the Volume Down button to scan for the previous frequency.

Save Frequency: When you find a desired channel, double-tap the Power button to save it. Up to 6 channels can be saved. If all 6 channels are saved, the oldest channel will be overwritten. Pressing the Power button again will cycle through the saved frequencies.

Universal (General) Pairing:

Entering Pairing Mode:

1. With the device powered on, press and hold the Intercom button for approximately 1 second until the red and blue LEDs flash alternately.
2. Enable pairing mode on the Bluetooth device you wish to connect.
3. Press the Intercom button on the B4FM again to search for other Bluetooth devices. The red and blue LEDs will flash rapidly. Pairing is complete when the blue LED flashes slowly.
4. To activate the universal intercom function, press and hold the Volume Up and Volume Down buttons simultaneously.
5. Press the Power button to end the intercom conversation.

Intercom Connection:

The B4FM Bluetooth headset supports full-duplex intercom, group pairing intercom, 4-way intercom (connecting 4 devices), and multi-way intercom modes. The multi-channel intercom mode allows simultaneous connection with up to 10 people.

Note: Before pairing devices for riding, it is recommended to disconnect any previously paired devices. To disconnect existing pairings, press and hold the Volume Up and Volume Down buttons simultaneously for 1 second. The LED flashing red rapidly indicates that previous connections have been cleared.

The default setting for B4FM intercom mode is 4-way intercom. If you wish to connect more than 5 devices, press and hold the Power button for approximately 8 seconds until a beep and rapidly flashing red LED indicate the switch to multi-way mode. Multi-way mode is not saved by default; the device will revert to the 4-way intercom mode upon powering on. Therefore, to connect more than 5 devices, you must press and hold the Power button for approximately 8 seconds each time you turn on the device to activate multi-way mode.

Refer to the pairing methods described below for 4-way intercom pairing.

Group Intercom Connection (2-way pairing - connecting two devices):

Press the Intercom button on both B4FM units to pair them. Press and hold the Intercom button on each unit for approximately 1 second. The LEDs on both units will flash alternately red and blue, indicating pairing mode is active.

Diagram Description: Shows two B4FM units. Step 1: Press and hold Intercom button for ~1 sec until LEDs flash red/blue. Step 2: Repeat for the second unit. Step 3: Press one unit's Intercom button to search. LEDs flash blue rapidly. Pairing complete when LEDs flash blue slowly.

Group Intercom Connection (3-way pairing - connecting three devices):

To connect a third B4FM unit, use the Intercom button and the Volume Down button. Press and hold the Intercom button and Volume Down button on the second and third units for 1 second. The LEDs on both units will flash alternately red and blue, indicating pairing mode is active.

Diagram Description: Shows three B4FM units. Step 1: Press and hold Intercom button for ~1 sec (first unit). Step 2: Press and hold Intercom + Volume Down for ~1 sec (second unit). Step 3: Repeat for third unit. LEDs flash red/blue alternately.

Group Intercom Connection (4-way pairing - connecting four devices):

To connect a fourth B4FM unit, use the Intercom button and the Volume Down button. With the device in standby mode, press and hold the Intercom button and Volume Down button on the third and fourth units for 1 second. The LEDs will flash alternately red and blue, indicating pairing mode is active.

Diagram Description: Shows four B4FM units. Step 1: Press and hold Intercom button for ~1 sec (first unit). Step 2: Repeat for second unit. Step 3: Press and hold Intercom + Volume Down for ~1 sec (third unit). Step 4: Repeat for fourth unit. LEDs flash red/blue alternately.

After pairing, press the Intercom button on one of the units. The units will search for each other and start pairing. The LEDs will flash blue rapidly. Once pairing is complete, the LEDs on all four units will flash blue slowly.

Note: If you are not connecting more than 2 devices, you only need to follow Step ① and can skip to "Starting Intercom Conversation" on page 16.

Starting Intercom Conversation:

Press the Intercom button on one of the paired units. The units will search for each other and begin pairing. The LEDs will flash blue rapidly. Pairing is complete when the LEDs on all units flash blue slowly.

Group Intercom Connection (Multi-way Mode):

To connect more than 5 devices, press and hold the Power button for approximately 8 seconds until you hear a beep and the red LED flashes rapidly. This switches to multi-way mode. This mode is not saved by default; you must activate it each time you turn on the device.

Refer to the 4-way intercom pairing methods described previously.

Warranty and A/S (After-Sales Service)

1-Year Free A/S Service:

• You are eligible for A/S within 1 year from the product purchase date.
• For initial defects (within 1 month of purchase), the product will be exchanged for a new one.
• After 1 month, the main unit will be repaired for parts replacement, excluding consumables (speakers, microphones, mounts, etc.).
• For initial defects, round-trip shipping costs incurred during product exchange will be covered by LEXIN Korea headquarters. After 1 month, the customer is responsible for round-trip shipping costs.
• The free A/S period is verified by the purchase receipt or transaction statement. Handwritten receipts are not accepted.
• If a purchase receipt is unavailable, the warranty is valid for 1 year from the manufacturing date.
• If the product is discontinued and cannot be exchanged or repaired, it will be replaced with a product of the same or higher class.

A/S Ineligible Cases:

• Damage or malfunction caused by user negligence or misuse.
• Damage or malfunction due to natural disasters such as floods, earthquakes, fires, etc.
• Damage or malfunction caused by unauthorized disassembly or modification of the product.

How to Request A/S:

• Visit the official LEXIN Korea website: www.lexin-korea.co.kr
• Navigate to Support Menu > Genuine Service > AS Application.
• Fill out the A/S application form and submit it. Required information includes: Customer Name, Contact Number, Place of Purchase, Serial Number, and Purchase Receipt.

RF Information

This device complies with FCC radiation standards. The end-user must adhere to the specific operating instructions provided to maintain compliance with RF exposure limits. The antenna used for this transmitter must not be co-located or operated in conjunction with any other antenna or transmitter, except in accordance with FCC multi-transmitter product procedures. This product complies with FCC radiation standards specified at the address below.

This device complies with Industry Canada license-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device. This EUT complies with SAR limits for general population/uncontrolled exposure as specified in IC-RSS-102 and tested according to measurement methods and procedures specified in IEEE 1528 and IEC 62209. This device should be installed and operated with a minimum distance of 1 cm between the device and the body. This device and its antenna must not be co-located or operated in conjunction with any other antenna or transmitter.

Disclaimer and Waiver of Rights

By using this product, you agree to the terms and conditions herein, including waiving your right to legal action and the right to seek compensation for damages.

You waive any right to claim compensation for any loss, liability, cost (including attorney fees), or damages incurred by you or any third party, regardless of the circumstances, environment, or jurisdiction, arising from the use of this product, including but not limited to personal injury, property damage, or death.

You, your heirs, legal representatives, successors, or assigns voluntarily waive all rights to sue, claim, demand, or hold us liable for any past, present, or future damages, injuries, losses, or deaths, whether direct or indirect, arising from the use of this product, to the maximum extent permitted by law.

You confirm that you are physically capable of using the product and have no medical conditions that would prevent safe use. You are 18 years of age or older and fully understand and acknowledge the risks associated with using the product. You further confirm that you will not use the product while under the influence of alcohol or any impairing substances, or while operating under the influence of substances that affect attention or judgment.

You acknowledge our warnings and understand the following:

• The risk of injury, illness, fracture, partial or total paralysis, death, or other serious disability that may occur from using this product on public roads.
• That these risks and dangers may arise from the negligence of the manufacturer or third parties involved in the design or manufacturing of the product.
• That these risks and dangers may occur due to reasons that are foreseeable or unforeseeable. You assume all responsibility for any risks and damages, including those arising from the negligence of LEXIN or any third party.

By using this product, you are deemed to have waived these legal rights and agreed to the terms and conditions stated above.