LEXIN LX-B4FM Motorcycle Bluetooth Intercom User Manual

Catalog

01 Function Introduction (機能紹介)

02 Product Packaging (商品に含まれるもの)

03 Installation Instructions (取付方法)

06 Basic Operation (機能と操作方法)

16 Maintenance & Certification (認定及び安全認証)

Function Introduction

Features:

• Bluetooth 5.0
• CVC & DSP Noise Cancellation
• Hands-free Calling
• Music Playback
• USB Type C (Charging Connector)
• Navigation Voice Guidance
• Voice Guide
• FM Radio
• Connectable with other intercom brands
• Voice Control
• Music Sharing

The LX-B4FM can connect up to 10 units, providing intercom communication up to approximately 2000m line of sight.

The LX-B4FM features Bluetooth 5.0 and supports HSP, HFP, and A2DP profiles, making it a universal intercom compatible with other Bluetooth-enabled intercoms.

Speaker:

Includes 36mm high-quality stereo speakers. The detachable speaker microphone can be attached to jet helmets and full-face helmets. The thin, high-quality speakers deliver clear call sound. The noise-canceling microphone reduces wind noise and ambient noise, providing powerful volume and high-quality sound even while riding.

Battery:

The LX-B4FM is equipped with an 800mAh lithium battery, offering approximately 15 hours of continuous talk time or 15 hours of music playback. Standby time is up to 1 week. Actual usage time may vary depending on usage conditions and environment.

Function Priority: Multiple functions cannot be used simultaneously. Functions operate in the following priority order (top is highest priority):

1. Smartphone, Mobile Phone (Call)
2. Intercom-to-Intercom Conversation
3. Music / FM Radio / Navigation

Note: Using a higher priority function will interrupt lower priority functions. For example, FM radio will be interrupted when having an intercom conversation, and a smartphone call will interrupt the intercom conversation.

For Safe and Correct Use:

Caution: Before using mobile phones or communication devices while riding a motorcycle, please check the laws and regulations of your local area beforehand.

Product Packaging

Items included:

• LX-B4FM Main Unit
• 3M Double-sided Tape Bracket
• 36mm Stereo Thin Earphones
• Arm/Wire Microphone
• Mounting Bracket Base
• Arm Mic Holder
• Mounting Bracket
• Instruction Manual
• Bracket Plastic Pad
• USB Type-C Charging Cable
• Bracket Rubber Pad
• Speaker Pad
• Main Unit Removal Pad
• Hex Wrench and Screws (x4)

Diagram description: The diagram shows the LX-B4FM main unit, various brackets, microphone types (arm and wire), speakers, cable, and small accessories.

Installation Instructions

Bracket Installation:

1. Screw Mount:

Place the mounting bracket and mounting bracket base between the helmet shell and the interior lining on the left side of the helmet, and tighten the screws.

Caution: Depending on the helmet size and shape, you may need to add thickness. Use the included rubber pads. You can also use the bracket plastic pads to add thickness to the other side. In that case, use longer screws.

2. 3M Double-sided Tape Bracket Installation:

If you do not wish to use screws, use the 3M double-sided tape bracket.

Before applying the double-sided tape, thoroughly clean the helmet surface to remove any oil. Press firmly and attach. Do not use immediately after mounting; wait approximately 24 hours before use.

Caution: We recommend the clamp-type mounting method. LEXIN is not responsible for any damage caused by using the double-sided tape method.

Mounting the Intercom Unit:

Align the LX-B4FM unit with the bracket and slide it down from the top. Push it in firmly until it clicks. Ensure it is fully secured.

To remove the unit, insert the included unit removal pad between the main unit and the bracket, then push the unit upwards from the bottom to detach it.

Speaker Installation:

Caution: To enhance FM radio reception, install the speaker with the shorter wire on the left side and the speaker with the longer wire on the right side. Position the speakers inside the helmet. Secure them using the velcro pads.

1. Place the speakers inside the helmet and secure them with the velcro pads.
2. If the helmet has deep ear pockets, use the included speaker pads for adjustment.
3. Route the wires along the inside of the helmet lining and padding.

Microphone Installation:

Caution: The wire microphone is for full-face helmets, and the boom microphone is for open-face helmets. Both types are compatible with either helmet.

Wire Microphone Installation:

1. For full-face helmets, attach the microphone to the center area.
2. Place the wire microphone on the velcro pad.
3. Connect it to the speaker on the left side.

Boom Microphone Installation:

1. Place the velcro pad inside the helmet lining and attach the microphone to the velcro pad.
2. Adjust the microphone so that the white triangle mark faces your mouth.
3. Use the boom mic holder if necessary.

Basic Operation

Power On/Off: Press and hold the [Power Button] and [Intercom Button] simultaneously for approximately 1 second.

Diagram description: Shows the LX-B4FM unit with labels for [Intercom Button], [LED], [Volume + Button], [Volume - Button], [Power Button], USB Type-C Earphone Port, USB Type-C Charging Port.

Powering On:

1. With the unit off, press and hold the [Power Button] and [Intercom Button] simultaneously for about 1 second. The blue [LED] lamp will flash, indicating the unit is powered on.
2. The unit will also announce the remaining battery level via voice.

Powering Off:

Press and hold the [Power Button] and [Intercom Button] simultaneously for about 1 second. The red [LED] lamp will light up once, and the unit will power off.

Battery:

Charging:

1. Connect the LX-B4FM unit to a charger using the USB Type-C cable to begin charging.
2. You can charge using any DC 5V power source, such as a smartphone charger or a computer's USB port. Please note that a charger is not included.
3. The red [LED] lamp will flash during charging. The blue [LED] lamp will light up when charging is complete.
4. Full charge takes approximately 3 hours.

Low Battery Notification:

1. When the battery level drops below 30%, a beep [Beep] will sound every 5 minutes to indicate low battery.
2. Approximately 1 to 1.5 hours after the low battery notification, the battery will run out.

Battery Level Check:

1. When powering on the LX-B4FM, the battery level will be announced by voice.
2. To check the current battery level, press and hold the [Volume - Button] for about 1 second. The battery level will be announced.

Note: Battery levels are announced as: 100% → 80% → 50% → 30% → Battery Low.

Volume Adjustment:

Volume Up/Down:

1. Use the [Volume + Button] and [Volume - Button] to adjust the volume.
2. Pressing the volume buttons once adjusts the volume step by step. Holding the buttons down adjusts the volume continuously.
3. Pressing the [Volume + Button] increases the volume.
4. Pressing the [Volume - Button] decreases the volume.

Note: Ensure your smartphone's volume is set to maximum when listening to music.

A beep [Beep] will sound when the volume reaches its maximum or minimum level.

Note: Volume can be adjusted during music playback, FM radio, intercom calls, and when receiving calls.

Playback and Functions

Play/Pause: Press the [Power Button] once to play music. Press the [Power Button] again to pause.

Track Change:

1. While music is playing, press the [Volume + Button] twice to skip to the next track.
2. While music is playing, press the [Volume - Button] twice to go back to the previous track.

Music Sharing Function:

You can share music playing on one LX-B4FM (Unit A) with another LX-B4FM (Unit B).

1. While music is playing on Unit A, double-press Unit A's [Power Button] to enter sharing mode.
2. Unit B, in standby mode, double-presses its [Power Button] to connect with Unit A. Music from Unit A will then play through Unit B's speakers.

Note: Music sharing is only possible between two intercom units. It is not supported for three or more units.

Ending Sharing: Press the [Power Button] twice to end music sharing.

Smartphone Calls:

Answering Calls: Short-press the [Power Button] to answer an incoming call.

Auto-Answer: If no action is taken, the call will be automatically answered after approximately 12 seconds.

Auto-Answer On/Off:

1. With the unit powered on, press and hold the [Volume + Button] for approximately 5 seconds. The blue [LED] lamp will flash 3 times, indicating auto-answer is enabled.
2. Press and hold the [Volume + Button] for approximately 5 seconds again. The red [LED] lamp will flash 3 times, indicating auto-answer is disabled.

Ending a Call: Press the [Power Button] once during a call to end it.

Rejecting a Call: Press the [Power Button] twice to reject an incoming call.

Redial: Press the [Volume + Button] twice to redial the last dialed number.

Voice Control: In standby mode, press the [Volume - Button] twice to activate voice assistants like Siri or Google Assistant.

FM Radio

Turning FM Radio On: Press and hold the [Power Button] for approximately 1 second to turn on the FM function.

Turning FM Radio Off: Press and hold the [Power Button] for approximately 1 second to turn off the FM function.

Scanning for Stations:

1. Higher Frequency: Press the [Volume + Button] twice. You will hear "Next track" and the unit will scan for stations at higher frequencies.
2. Lower Frequency: Press the [Volume - Button] twice. You will hear "Previous track" and the unit will scan for stations at lower frequencies.

Saving Stations: With FM on, double-click the [Power Button]. An announcement will play, and the current station will be saved. Up to 6 stations can be saved.

Listening to Saved Stations: With FM radio on, single-click the [Power Button] to listen to the saved stations.

Reset:

1. Press and hold the [Volume + Button] and [Volume - Button] simultaneously for approximately 1 second to reset the unit.
2. The red [LED] lamp will flash, indicating the reset is complete.

Bluetooth Device Connection

Note:

1. One LX-B4FM unit can connect to a maximum of two other LX-B4FM units and one smartphone simultaneously.
2. After pairing, the LX-B4FM will automatically connect when powered on, provided the Bluetooth switch on the connected device is also turned on.
3. In standby mode, a single press of the [Power Button] will initiate an automatic connection.

Smartphone Pairing:

1. With the unit powered off, press and hold the [Power Button] for approximately 5 seconds. The [LED] lamp will flash blue and red, indicating pairing mode.
2. On your smartphone's Bluetooth search screen, select "LX-B4FM".
3. Tap to begin pairing. If a PIN is required, enter "0000".
4. Confirm if pairing was successful on your smartphone.

Note: The [LED] lamp flashing blue indicates successful pairing.

Navigation and Pairing

1. With the unit powered off, press and hold the [Power Button] for approximately 5 seconds. The [LED] lamp will flash blue and red, indicating pairing mode.
2. Refer to the instruction manual of your navigation device for pairing procedures. Follow the manual's steps to connect with the LX-B4FM.
3. Once paired, you can receive navigation voice guidance through the LX-B4FM.

Universal Intercom Function:

You can pair and communicate with other brands of Bluetooth-compatible intercoms. The pairing procedure with other intercoms is as follows:

1. In standby mode, press and hold the LX-B4FM's [Intercom Button] for approximately 1 second. The [LED] lamp will flash blue and red, indicating pairing mode.
2. Follow the instruction manual of the other intercom to put it into pairing mode.
3. Press the LX-B4FM's [Intercom Button] once. The blue [LED] lamp will flash rapidly. When the blue [LED] lamp flashes slowly, pairing is complete.
4. After pairing, press and hold the [Volume + Button] and [Volume - Button] simultaneously for 1 second to enter the call state.
5. During a call, press the [Power Button] once to end the call.

Group Intercom Function:

The LX-B4FM utilizes full-duplex Bluetooth communication to enable group calls. The group call function supports both a 4-person mode and a 5+ person mode.

Note:

1. It is recommended to reset the unit before pairing. Press and hold the [Volume + Button] and [Volume - Button] simultaneously for approximately 1 second. The red [LED] lamp will flash, indicating a reset.
2. The default setting for the LX-B4FM is the 4-person group intercom mode. To switch to the 5+ person mode, press and hold the [Power Button] for approximately 8 seconds in standby mode. You will hear a "beep beep" [Beep] sound, and the red [LED] lamp will flash rapidly, indicating entry into the 5+ person mode.
3. This mode change is not saved. If you power cycle the unit, it will revert to the 4-person group intercom mode. To use the 5+ person mode again, you must re-enable it by pressing and holding the [Power Button] for approximately 8 seconds. Once in the 5+ person mode, follow the pairing procedure to pair your devices.
4. You can connect up to 4 LX-B4FM units by following the "4-Unit Pairing Procedure".

Pairing Procedures

Procedure 1: Connecting 2 LX-B4FM Units

1. Power on both LX-B4FM units. Press and hold the [Intercom Button] on both units for approximately 1 second to enter pairing mode. The [LED] lamps will flash blue and red.
2. Press the [Intercom Button] on either LX-B4FM unit once to automatically search for and connect to the device. During connection, the blue [LED] lamp will flash rapidly. When the blue [LED] lamp flashes slowly, pairing is complete, and a voice announcement will be made.

Diagram description: Shows two LX-B4FM units. First step shows holding the [Intercom Button] on both units. Second step shows pressing the [Intercom Button] on one unit, with LEDs flashing, leading to a "Pairing Complete" state with slow blue [LED] flashing.

Note: For pairing 2 LX-B4FM units, only Procedure 1 is necessary. Pairing is complete at this stage. Refer to the "Intercom Call Operation" on page 15.

Procedure 2: Connecting 3 LX-B4FM Units

1. Turn on the 3rd LX-B4FM unit. Press and hold the [Intercom Button] and [Volume - Button] simultaneously on the 2nd and 3rd LX-B4FM units for approximately 1 second to enter pairing mode. A voice announcement will be made, and the [LED] lamps will flash blue and red.
2. Press the [Intercom Button] on either unit once to automatically search for and connect to the devices. During connection, the blue [LED] lamp will flash rapidly. When the blue [LED] lamp flashes slowly, pairing is complete.

Diagram description: Shows three LX-B4FM units. First step shows holding [Intercom Button] + [Volume - Button] on units 2 and 3. Second step shows pressing [Intercom Button] on one unit, leading to pairing completion with slow blue [LED] flashing on all units.

Note: For pairing 3 LX-B4FM units, only Procedure 1 is necessary. Pairing is complete at this stage. Refer to the "Intercom Call Operation" on page 15.

Procedure 3: Pairing 4 Units

By following Procedure 1 and Procedure 2 sequentially, you can connect 4 to 10 LX-B4FM intercom units.

Pairing Steps:

1. Follow Procedure 1 to pair the 1st and 2nd units.
2. Follow Procedure 2 to pair the 2nd and 3rd units.
3. Follow Procedure 1 to pair the 3rd and 4th units. Press and hold the [Intercom Button] on the 3rd and 4th LX-B4FM units simultaneously for approximately 1 second to enter pairing mode. The [LED] lamps will flash blue and red.
4. Press the [Intercom Button] on either unit once to complete the pairing.

Diagram description: Shows the pairing process for 4 units, building upon previous steps. It illustrates holding buttons and [LED] status for units 3 and 4, then connecting them. The final state shows all 4 units paired.

Note: For pairing 4 LX-B4FM units, only Procedure 1 is necessary. Pairing is complete at this stage. Refer to the "Intercom Call Operation" on page 15.

5 to 10 Unit Pairing

1. Mode Switching: The default setting for the LX-B4FM is 4-person group intercom. To communicate with 5 or more units, you must switch to the 5+ person mode.

2. Mode Switching Procedure: In standby mode, press and hold the LX-B4FM's [Power Button] for approximately 8 seconds. You will hear "beep beep" [Beep] sounds, and the red [LED] light will flash rapidly, indicating that the 5+ person mode has been activated. This must be done for all units.

3. Mode Persistence: The mode change is not saved. Upon rebooting the unit, it will automatically revert to the 4-person group intercom mode. To pair 5 or more units, you must re-enable the 5+ person mode by repeating the process. Once in the 5+ person mode, follow the pairing procedures below.

Diagram description: Shows the LX-B4FM unit with an arrow [Arrow] indicating pressing and holding the [Power Button] for 8 seconds to switch to 5+ person mode (red [LED] flashing).

5+ Person Mode Pairing Procedure:

Diagram description: Illustrates the pairing process for multiple units (5+). It shows sequential pairing steps (Procedure 1, Procedure 2) being applied between units, starting from unit 1 to unit 2, then unit 2 to unit 3, and so on, up to unit 5 and unit 4. The final state shows successful pairing.

Note: One LX-B4FM unit can connect to a maximum of two other LX-B4FM units simultaneously. For example, a 3rd LX-B4FM unit can pair with the 2nd and 4th units. However, it cannot connect to other devices if it is already connected to two other units.

2-4 Unit Intercom Calls:

1. After pairing, press the [Intercom Button] on one unit once to automatically enter the call state.
2. Press the [Power Button] once to end the call.
3. If a call is ended, press the [Intercom Button] once to return to intercom communication.

Multi-Person Calls:

1. After pairing, press the [Intercom Button] on one unit once to automatically enter the call state.
2. Ending a Call: Press the [Power Button] once to end the call for that specific B4FM unit. In a 5+ person call, this may split the group into two separate group calls.
3. If a person leaves a group call, pressing the [Intercom Button] once will allow them to rejoin the group call, forming a single group call again.

Example: 8-Person Group Call - One Person Leaves and Rejoins

If the 3rd LX-B4FM unit ends its call, the group will automatically split into two: units 1 and 2 in one group, and units 4 through 8 in another. The 3rd LX-B4FM unit will be excluded from these group calls.

By pressing the [Intercom Button] on the 3rd unit again, it will rejoin the 8-person group call.

Precautions

Group Calls:

1. Group connections are made in a chain. Each LX-B4FM unit functions as a link in the chain. To maximize the communication range during touring, align the riding order with the connection order.
2. While in a group call, you cannot connect to other Bluetooth-compatible intercoms. You can connect to a smartphone, but an incoming phone call will end the group call.

Connection:

Connecting to other devices may take a few seconds. Please wait for the connection to complete before attempting to communicate.

Call Range:

If riders become too far apart during a conversation, noise may be introduced, or the connection may be interrupted. The connection will automatically re-establish when the distance decreases.

Battery Protection:

To protect the battery, disconnect the unit when not in use.

Maintenance & Certification

FCC Regulations: This product complies with FCC (Federal Communications Commission) rules and is CE marked.

Giteki Mark: This product is Giteki (Telecommunication Equipment) marked.

For Safe Use of This Product:

• Please read the following precautions carefully to ensure safe use of the LX-B4FM. When using this product on roads, comply with the ordinances of each prefecture and local government.
• Do not ride while listening at high volume. This may prevent you from hearing important sounds, potentially leading to serious accidents.
• Do not apply excessive force to the unit. Doing so may cause damage, malfunction, or other operational failures.
• Do not disassemble or modify this product. Doing so may cause fire or electric shock.

Troubleshooting

If you encounter any of the following issues, please re-check the instructions in this manual. If the problem persists, please contact customer support using the information provided in the warranty card.

LX-B4FM Does Not Power On:

• Check if the unit's power is turned on.
• Ensure the battery is sufficiently charged.
• Check if the red [LED] lamp lights up during charging.
• Try using a different charging cable, power adapter, and outlet to see if it can charge.
• After charging for 3 hours, check if the blue [LED] lamp lights up.

LX-B4FM Not Connecting Properly with Smartphone/Mobile Phone:

• Check if the unit's power is turned on.
• Ensure the battery is sufficiently charged.
• Verify that your smartphone/mobile phone can make calls.
• Ensure the Bluetooth function on your smartphone/mobile phone is turned ON.
• Confirm that pairing between the unit and your smartphone/mobile phone was completed successfully.
• Reset the unit, restart your smartphone/mobile phone, and try pairing again, referring to this manual. (Unregister the Bluetooth device on your smartphone/mobile phone, power it off, and then restart.)

Cannot Hear the Other Party's Voice:

• Ensure the speaker microphone is securely plugged in.
• Confirm that the microphone part is properly attached to the unit.
• Check that the microphone's sound intake hole is facing your mouth.
• Try swapping with the other included microphone to see if the voice can be transmitted.

Firmware Update

Update methods are also described on our website. Please check:

http://lexinjapan.com/support/

Warranty

Warranty Terms:

• This product's warranty period is one year from the date of purchase. During this period, if a malfunction occurs due to manufacturing defects or material defects, LEXIN will provide free repair, product exchange, or exchange with an equivalent product at its discretion.
• However, malfunctions due to misuse, accidents, or unauthorized repairs or modifications are not covered by the warranty. Malfunctions due to natural disasters are also not covered.
• Speaker microphones are consumables and have a warranty period of 6 months. Loss, degradation, or connection issues during the warranty period or use are not covered. Please understand this in advance.
• LEXIN is not liable for any direct or indirect damages (accidents, injuries, loss of time, inconvenience, loss of profit, incidental expenses) caused by product failure.
• If the unit shows significant external damage or cracks upon purchase, it will be considered outside the warranty coverage. Please understand this in advance.
• To request warranty repair, please email LEXIN at the address provided in the "Returns/Exchanges" section.
• Repairs may be charged even within the warranty period. Please understand this in advance.
• Malfunctions caused by water ingress are not covered by the warranty under any circumstances. Please understand this in advance.

Returns/Exchanges

For warranty repairs, please email our "Returns/Exchanges" department at the email addresses listed below.

In case of initial defects or malfunctions within the warranty period, please contact your purchase shop or the email addresses above. When contacting us, please provide the following information:

• Product Name
• Serial Number
• Place of Purchase, Date of Purchase, and Proof of Purchase (Warranty Card)
• Description of Malfunction
• Name
• Address
• Contact Information