LEXIN B4FM Motorcycle Bluetooth Intercom

Download User Manual Online

For online user manuals in English, Spanish, German, Italian, French, Japanese, and more, visit www.lexinmotorcycle.com. Navigate 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.lexinmotorcycle.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.lexinmotorcycle.com, vai su Support - User Manual, e seleziona “B4FM”.

Deutsch: Online Bedienungsanweisung auf Englisch, Spanisch, Deutsch, Italienisch, Französisch, Japanisch usw., besuchen Sie www.lexinmotorcycle.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.lexinmotorcycle.com, vaya al Soporte - Manual de Usuario, y seleccione “B4FM”.

Watch Instruction Video Online

Subscribe to the LEXIN YouTube channel @lexinmoto to find "B4FM" instruction videos. Look for videos featuring the X icon button.

Note: For the most updated instruction video, click the link showing the X icon button and USB-C connector.

Français: Suivez notre chaîne Youtube @lexinmoto, et trouvez les vidéos "B4FM" (Avec le bouton de l'icône X) Instruction.

Italiano: Iscriviti al nostro canale Youtube @lexinmoto, e trova i video di "B4FM" (con il pulsante con l'icona X) Instruction.

Deutsch: Abonnieren Sie unseren YouTube-Kanal @lexinmoto und suchen Sie das Video "B4FM" (mit X-Taste) Instruction.

Español: Regístrese nuestro Youtube channel @lexinmoto, y encuentre videos "B4FM" (Con el botón del icono X) Instruction.

Function Introduction

Thank you for choosing the B4FM Motorcycle 10-Way Bluetooth Conference Intercom.

Key Features:

• Bluetooth 5.0
• Connect to GPS Navigation
• Hands-free calling
• Plays music and FM Radio
• Built-in CVC/DSP noise reduction
• Support Music Sharing
• USB-C quick charge equipped
• Support voice prompts, power voice announcement
• Support Siri and other voice assistants
• Support universal pairing with most Bluetooth Intercoms
• Support 1-10 B4FM devices connection, with a longest intercom distance of 2Km/1.2miles.

Bluetooth Specification V5.0 Compliance:

The B4FM is compliant with Bluetooth Specification V5.0 supporting the following profiles: Headset Profile (HSP), Hands-Free Profile (HFP), and Advanced Audio Distribution Profile (A2DP). It supports universal pairing with almost all Bluetooth headsets on the market.

Battery:

The B4FM features an 800 mAh battery, providing up to 15 hours of music or 15 hours of intercom talk time, with over one week of standby time.

Function Priority:

(The B4FM operates in the following order of priority)

1. Mobile phone
2. Intercom Talk
3. Music/FM Radio/GPS

Note: A lower-priority function is always interrupted by a higher-priority function. For example, stereo music can be interrupted by an intercom call, and intercom talk can be interrupted by an incoming phone call.

WARNING

PLEASE CHECK ALL LOCAL LAWS AND REGULATIONS REGARDING THE USE OF IN-HELMET SPEAKERS WHILE OPERATING MOTORIZED VEHICLES.

Package Contents

The package includes:

• B4FM Main Unit
• 36mm HD Ultra-Slim Speakers
• Boom/Button Microphones
• Boom Microphone Holder
• Mounting Bracket
• Clamp Plate
• Add on Mounting Pad
• 3M Tape Bracket
• User Manual/Quick Start Guide
• USB-C Cable
• Speaker Pad
• Allen Wrench & Screws (x4)
• Rubber Pad for Clamp Plate (x2)
• Dismounting Stick

Diagram Description: The package contents are visually laid out, showing the main unit, speakers, various microphone types, mounting hardware (brackets, plates, pads, screws), a dismounting stick, and the user manual.

Installation Instructions

Installing Bracket for B4FM to Helmet

1. With Screws: Mount the bracket between the internal padding and external shell of the helmet. Tighten the two screws using the included Allen wrench. Note: Adjust with 0-2 rubber pads on recommended positions (A, B) based on helmet shell thickness. Use longer screws if adding the plastic mounting pad on position C.
2. With Adhesive Pad: If not using the clamp plate, use the 3M tape bracket. Peel off the protective backing, adhere the bracket to the helmet, and press for 15 seconds. Allow 24 hours for the glue to dry. Note: LEXIN recommends bracket mounting; the 3M tape bracket is an option for convenience, used at your own risk.

Mounting the B4FM Unit to Bracket

Slide the B4FM main unit down onto the bracket until it clicks firmly into place. To remove, insert the Dismounting Stick between the unit and bracket, then push the unit upwards.

Installing Speakers

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

1. Place one half of the speaker velcro pad into the helmet's inner padding.
2. Push the speakers firmly against the velcro pads. Use provided spacers if the helmet has deep ear pockets to position speakers closer.
3. Hide wires between the helmet liner and shell.

Note: For helmets with deep ear pockets, use the included speaker pads to increase speaker thickness.

Installing Microphone

Note: Button and boom microphones are interchangeable between full-face and open-face helmets, based on preference and fit.

Full Face Helmet/Button Microphone:

1. Locate an area in the center of the mouth section of the helmet. Adhere half of the microphone velcro pad.
2. Attach the button microphone to the velcro.
3. Connect it to the headphone connector from the left.

Open Face Helmet/Boom Microphone:

1. Adhere one half of the velcro pad to the base of the microphone and the other half to the inside of the helmet under padding.
2. Adjust the microphone direction so the triangular mark points towards your mouth.
3. Use the boom microphone holder for additional support if necessary.

General Operation Instructions

Power on/off: Hold the Power Button [power-symbol] and Intercom Button [intercom-symbol] simultaneously for 1 second.

Device Overview:

Diagram Description: The B4FM unit is shown with labels for UP Button, Power Button, Intercom Button, Down Button, USB port, USB-C Headset Port, and USB-C Charging Port.

Powering On/Off:

• Power On: Long press the Power Button and Intercom Button for about 1 second. The LED will blink blue. The speaker will report "power on" and the current battery level.
• Power Off: Long press the Power Button and Intercom Button for about 1 second. The LED will blink red. The speaker will report "power off".

Battery

Charging:

Plug the USB-C cable into the unit's USB-C port and the USB end into a DC 5V power supply (e.g., mobile charger, computer, power bank). The LED turns red while charging and blue when fully charged. Charging takes approximately 3 hours.

Low Battery Alert:

The device notifies you when the battery drops below 30%, with reminders every 5 minutes. This indicates approximately 1-1.5 hours of use remaining. The device automatically shuts down when the battery is below 20%.

Battery Life Prompt:

Upon turning on the unit, it reports the current battery life. In standby mode, long press the Down Button for about 1 second to hear the current battery level (reported as 100%, 80%, 50%, 30%, or LOW).

Pairing B4FM with Bluetooth Devices

Note: In group intercom mode, one LX-B4FM device can connect to up to two LX-B4FM devices and one mobile phone simultaneously. It automatically connects to the last paired device when Bluetooth is enabled or when the device is not connected and in standby mode. Click the Power Button to connect.

Pairing Phone:

1. While powered off, long press the Power Button [power-symbol] for about 5 seconds until the LED flashes blue and red alternately to enter pairing mode. Note: Do not use the Intercom Button for pairing phones or GPS devices.
2. On your phone's Bluetooth settings, select "LX-B4FM". Some phones may require a PIN; enter "0000".
3. Confirm pairing on your phone. Note: The LED will blink blue on the B4FM device when the connection is completed.

Pairing Bluetooth GPS Navigation:

1. While powered off, long press the Power Button for about 5 seconds until the LED flashes blue and red alternately to enter pairing mode.
2. Follow your specific GPS Navigation's pairing instructions to connect to the B4FM. Note: You will hear Bluetooth voice instructions from the GPS navigation once paired.

Phone Calls

• Answer Call: Click the Power Button when a call is incoming.
• Auto Answer: Incoming calls will automatically be answered after 12 seconds.
• Preset On/Off Automatic Answering: With power on, long press the Up Button for about 5 seconds. The blue light flashes 3 times for automatic answering ON, or the red light flashes 3 times for automatic answering OFF.
• End Call: Click the Power Button to end the call.
• Decline Call: Double click the Power Button to reject the call.
• Redial: In standby mode, double click the Up Button to redial the last phone call.
• Voice Dial: While paired with your phone, double click the Down Button to activate Siri or S-Voice. Speak the name from your phone list to dial.

Volume and Music Controls

• Volume Up/Down: Long press the Volume Up or Down Button. It will prompt when volume is at maximum or minimum. Note: Volume adjustment is only available in music playing, FM Radio, Intercom, or Phone Call modes. Adjust phone volume for louder output. Single click adjusts volume gradually; long press adjusts continuously.
• Pause/Play: Click the Power Button to pause, click again to resume playing.
• Change Song: Double click the Up Button for the next song, double click the Volume Down Button for the previous song.

Music Sharing

Device A (playing music) can share music to Device B. When Device A is playing music, double click the Power Button on Device A to enter music sharing mode. Ensure Device B is in standby, then double click the Power Button on Device B to search and connect to Device A. Music will play automatically on both devices.

Stop Music Sharing: Double click the Power Button on either B4FM device.

Intercom Connection

The B4FM supports full-duplex Bluetooth intercom talk, with pairing group internal intercom, divided into 4-way and multi-way intercom modes. Multi-way intercom mode can connect up to 10 riders.

Note: Before pairing for communications, it is strongly suggested to clear existing connections. To do so, long press the Up and Down Buttons together for about 1 second until the red LED flashes quickly.

By default, the B4FM device operates in 4-way intercom mode. To switch to multi-way intercom mode (for more than 5 riders), in standby state, long press the Power Button for about 8 seconds on all units. A beep sound and quick red LED flash will indicate the switch.

Note: This operation is not remembered; you must switch it every time when connecting over 5 units.

Bluetooth Intercom Pairing & Connection

Step 1 (2-Way Pairing):

Power on two B4FM units. Long press the Intercom Button on both units for about 1 second. The LED on both units will flash red and blue alternately, indicating pairing mode.

Diagram Description: Two B4FM units are shown. Arrows indicate long pressing the Intercom Button on Unit One until LED flashes red and blue. Similarly for Unit Two. Then, clicking the Intercom Button on either unit to search and pair. The LED flashes blue quickly. Once paired, the LED blinks blue slowly on both units.

Start the intercom talk: After successful pairing, click the Intercom Button on any unit to start talk. The LED will blink blue and red simultaneously. Click the Power Button to temporarily disconnect the intercom; click the Intercom Button again to resume.

Step 2 (3-Way Pairing):

After completing Step 1 (units 1&2 paired), press the Intercom Button and Down Button to pair the second and third B4FM devices. Power on the second and third B4FM units. Long press the Intercom Button and Down Button on both units for about 1 second. The LED on both units will flash red and blue alternately.

Diagram Description: Shows Unit One paired. Then, Unit Two and Unit Three are powered on. Long press Intercom & Down Button on Unit Two and Unit Three until LED flashes red and blue. Click Intercom Button on one unit to search and pair. LED flashes blue quickly. Pairing complete: LED blinks blue slowly on all three units.

Note: If only pairing three devices, complete Step 2 after initial pairing, then start intercom talk. If the second device disconnects, others will also disconnect.

Four-way Pairing:

After completing Step 1 and Step 2 (units 1&2&3 paired), press the Intercom Button to pair the third and fourth B4FM devices. On standby, long press the Intercom Button on the third and fourth units for about one second. The voice will prompt "pairing", and the LED light on both units will flash red and blue alternately.

Diagram Description: Shows units 1, 2, 3 paired. Then, Unit Four is powered on. Long press Intercom Button on Unit Three and Unit Four until LED flashes red and blue. Click Intercom Button on one unit to search and pair. LED flashes blue quickly. Pairing complete: LED blinks blue slowly on all four units.

Start the intercom talk: After successful pairing, click the Intercom Button on any unit to start talk. The LED will blink blue and red simultaneously. Click the Power Button to temporarily disconnect; click the Intercom Button again to resume.

Note: When one device disconnects, the intercom group splits into two. Click the Intercom Button again to re-establish the intercom, reconnecting the two independent groups.

Multi-way Group Intercom

By default, the B4FM device operates in 4-way intercom mode. To switch to multi-way intercom mode (for more than 5 riders), in standby state, long press the Power Button for about 8 seconds on all units. A beep sound and quick red LED flash will indicate the switch.

Note: This operation is not remembered; you must switch it every time when connecting over 5 units.

Group Pairing:

Diagram Description: Illustrates sequential pairing for multiple units. For example, Unit One pairs with Unit Two. Unit Three pairs with Unit Two. Unit Four pairs with Unit Three. Unit Five pairs with Unit Four. This shows a chain-like pairing process.

Note: Each B4FM device can only be paired with two other B4FM devices at a time. To connect multiple units, sequential pairing is required.

Start the intercom talk: After successful pairing, click the Intercom Button on any unit to start talk. The LED will blink blue and red simultaneously. Click the Power Button to temporarily disconnect; click the Intercom Button again to resume.

Clear The Pairing: Long press the Up and Down Buttons simultaneously for about 1 second; the red light will flash quickly.

Universal Pairing

To enter pairing mode:

1. With power on, long press the Intercom Button for about 1 second until the LED begins flashing blue and red alternately.
2. Follow your other Bluetooth device pairing instructions to enter pairing mode.
3. Click the Intercom Button on B4FM to search for the other device. The LED light will flash blue and red quickly. After pairing is completed, the LED light returns to blue, flashing slowly.
4. To initiate universal intercom, click the Up Button and Down Button together.
5. Click the Power Button to end the intercom talk.

FM Radio

On/Off:

• Turn On FM Radio: Long press the Power Button for about 1 second to enter radio function.
• Turn Off FM Radio: When the radio is on, long press the Power Button for about 1 second to end radio function.

FM Radio Station Search:

• Turn up: Double click the Down Button. The voice will prompt to adjust the radio station upwards.
• Turn down: Double click the Up Button. The voice will prompt to adjust the radio station downward.

Store up to 6 FM Radio Stations:

In FM radio mode, when a favorite station is found, double click the Power Button to save it. A tone will prompt. Up to 6 stations can be stored. Saving a new station overwrites the oldest saved station. Click the Power Button to cycle through saved stations.

Maintenance & Certification

NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.

Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:

1. (1) this device may not cause harmful interference, and
2. (2) this device must accept any interference received, including interference that may cause undesired operation.

Contact Information

Lexin Electronics Inc.

1(800) 380 - 8248

www.lexin-moto.com

FCC ID: 2ARGO-B4FM

Backed by 2-Year Warranty

For technical support: tech@lexinmotorcycle.com

Follow us on social media: f [instagram-icon] @lexinmoto