1. Introduction
Thank you for purchasing the VAORLO M9/M9Pro Bluetooth Audio Adapter. This intelligent device integrates both Bluetooth receiving (RX) and transmitting (TX) functionalities into a single unit, offering versatile audio solutions for various devices. It features a Bluetooth 5.1 chip for stable, low-latency connections and a DSP decoding chip for high-fidelity sound quality with adjustable treble and bass.
Key features include:
- 2-in-1 Functionality: Bluetooth Receiver (RX) and Transmitter (TX) modes.
- Bluetooth 5.1: Ensures stronger compatibility, stability, and no noticeable delay.
- DSP Decoding Chip: Provides Hifi-grade fidelity sound quality with adjustable bass and treble.
- HD LED Display: Clearly shows working mode, FM frequency, and signal source.
- NFC Function: One-touch automatic connection for NFC-enabled mobile phones/tablets.
- Multiple Audio Interfaces: Supports 3.5mm AUX, RCA, USB U-Disk, TF card, and 6.5mm Microphone input/output. The M9 model also includes Coaxial input, while the M9 Pro model features FM Radio.
- Karaoke Support: Built-in 6.5mm microphone interface for wired or wireless stereo singing with anti-howling design.
- Media Playback: Supports MP3/WMA/SBC/WAV/DTS/A52/FLAC/AAC/AIF/AMR/APE music formats from USB flash disk and TF card.
- Long Battery Life: Equipped with a 1200mAh polymer lithium battery, offering 8-10 hours of continuous use and up to 30 days standby. Supports charging while playing.
- Remote Control: Includes an infrared remote control for mode, volume, song selection, mixing, and microphone adjustments (Note: Remote control does not support power-on function).
- Wireless Range: Up to 30 meters Bluetooth transmission distance in open areas.
This product is designed to upgrade old audio equipment, enabling wireless music streaming and transmission to various devices like active speakers, amplifiers, TVs, PCs, Bluetooth headphones, and speakers.
Product overview video demonstrating features and connectivity.
2. Package Contents
Please check the box for the following items:
- 1x VAORLO Bluetooth Audio Adapter (M9 or M9 Pro model)
- 1x Bluetooth Antenna
- 1x Type-C Charging Cable
- 1x RCA Cable
- 1x 3.5mm AUX Cable
- 1x Remote Control
- 1x User Manual (This document, also available as a PDF manual)
- For M9 Pro only: 1x FM Antenna
Image showing the VAORLO M9 Pro Bluetooth audio adapter and its included accessories.
3. Interface Diagram and Controls
Familiarize yourself with the ports and controls of your VAORLO M9/M9Pro adapter:
Detailed schematic diagram of the M9 Pro interface, highlighting all input and output ports.
Front Panel:
- 6.5mm MIC Interface: For connecting a microphone.
- LED Display: Shows current mode, frequency, and status.
- Bass Knob: Adjusts bass levels.
- Treble Knob: Adjusts treble levels.
- ON/OFF/Volume Knob: Powers the device on/off and adjusts overall volume.
Top Panel Buttons:
- M (Mode) Button: Long press to switch between Bluetooth modes (RX/TX). Single click to switch signal sources within a mode.
- Previous Song/Rewind Button: Short press for previous song/station. Long press to rewind or adjust FM frequency down.
- Play/Pause Button: Short press to play/pause. Double click to enter automatic FM search. Long press to enter manual FM search (FM radio only).
- Next Song/Forward Button: Short press for next song/station. Long press to fast forward or adjust FM frequency up.
Rear Panel:
- FM Antenna Port: For connecting the FM antenna (M9 Pro only).
- RCA (L-AUDIO-R) Ports: For RCA audio input/output.
- AUX Port: For 3.5mm AUX audio input/output.
- DC 5V Port: Type-C port for power supply and charging.
- BT Antenna Port: For connecting the Bluetooth antenna.
- USB Port: For USB flash disk playback.
- TF Card Slot: For TF card playback.
- Coaxial Input: For coaxial audio input (M9 model only).
4. Specifications
| Feature | Specification |
|---|---|
| Product Model | M9 / M9 Pro |
| Bluetooth Version | Bluetooth V5.1 |
| Supported Protocols | A2DP/AVRCP/HSP/OPP/GATT/SM |
| Working Frequency Band | 2.402GHz - 2.480GHz |
| Power Level | Class II |
| Sensitivity | -85dBm < 0.1%BER |
| Signal-to-Noise Ratio | ≥90dB |
| Distortion | ≤0.1% |
| M9 Input Interface | 3.5mm AUX/RCA/USB/TF/6.5 MIC/Coaxial |
| M9 Pro Input Interface | 3.5mm AUX/RCA/FM Radio/USB/TF/6.5 MIC |
| Output Interface | 3.5mm AUX/RCA |
| M9 Pro FM Radio Frequency | 87.5-108MHz |
| Supported Audio Formats | MP3/WAV/WMA/APE/FLAC/G729/M4A/ALAC/AMR/DTS/MIDI/G726/MTY |
| Screen Size | 36*8MM |
| Working Current | <40mA |
| Built-in Battery | 3.7V/1200mAh Lithium Battery |
| Charging Current | ~1000mA (MAX) |
| Charging Time | ~1.5 hours |
| Battery Life (RX/TX) | ~8 hours |
| Bluetooth Distance | ≤30M (open place) |
| Charging Method | Type-C 5V/1A |
| Product Size | L98mm x W67mm x H23.5mm |
| Net Weight | ~143g |
| Compatibility | Android, iOS mobile phones and PADs, active speakers, power amplifiers, Bluetooth speakers/earphones supporting A2DP protocol. |
Note: The above dimensions are measured manually, and there may be slight errors.
Image illustrating the product dimensions and remote control dimensions.
5. Setup
5.1. RX Mode (Receiving Mode) Setup
This mode is suitable for active speakers, old audio systems, headphones, power amplifiers, cars, and other devices with AUX or RCA audio input interfaces. It upgrades ordinary wired speakers to Bluetooth stereo, allowing music to be transmitted wirelessly from mobile phones to these devices.
Diagram showing how to connect the adapter in RX (receiving) mode to various audio devices.
Step 1: Connect/Power On
- Use a 3.5mm AUX or RCA audio cable. Plug one end into the adapter's output port and the other end into the audio input interface of your target device (e.g., active speakers).
- Power on the device. The RX indicator and the 'BLUE' text on the display screen will flash, indicating that the adapter is in receiving mode. (RX mode is the default when first powered on; otherwise, long press the 'M' button to switch. The device has mode memory.)
Step 2: Pairing with Phone/Tablet (NFC Supported)
- Enable Bluetooth on your mobile phone or tablet. Search for and select "M9 Pro" (or "M9") from the list of available devices. Once paired, the RX and 'BLUE' lights will become steady.
- Open your music application. Audio will now be transmitted to the connected active speaker via Bluetooth. You can control playback (play/pause, adjust volume, switch signal sources) using the adapter's buttons or remote control.
5.2. TX Mode (Transmitting Mode) Setup
This mode is applicable for devices with audio output interfaces (such as AUX/RCA) like computers, laptops, televisions, amplifiers, and projectors. It enables these devices to wirelessly connect to Bluetooth headsets or Bluetooth speakers.
Diagram showing how to connect the adapter in TX (transmitting) mode to various audio sources.
Step 1: Connect/Power On
- Use a 3.5mm AUX or RCA audio cable. Plug one end into the adapter's input port and the other end into the audio output connector of your source device (e.g., computer, TV).
- Power on the device. The TX indicator will flash, and the screen will display 'AUX', indicating that the adapter is in transmission mode with AUX wired input. (If the device is in RX mode, long press the 'M' button to switch to TX mode.)
Step 2: Bluetooth Pairing
- Place the adapter near the Bluetooth headset or speaker, ideally within 10-30 meters, ensuring the adapter is powered on and in TX mode.
- Turn on your Bluetooth headset or speaker and ensure they are in pairing mode.
- After successful pairing, 'AUX' will be displayed on the screen, and the TX indicator will be steady. The audio from your computer/TV will now be transmitted wirelessly to your Bluetooth headset or speaker.
6. Operation
6.1. Key Operations
| Key/Action | Function (Short Press) | Function (Long Press) | Function (Double Click) |
|---|---|---|---|
| ON/OFF/Volume Knob | Rotate to adjust volume | Rotate clockwise to power on | N/A |
| M (Mode) Button | Switch signal source | Switch Bluetooth mode (RX/TX) | N/A |
| Previous Song Button | Previous song/station | Rewind / Adjust FM frequency down / MIC Vol- (after MIC connected) | N/A |
| Play/Pause Button | Play/Pause | Enter manual FM search (FM radio only) | Enter automatic FM search |
| Next Song Button | Next song/station | Forward / Adjust FM frequency up / MIC Vol+ (after MIC connected) | N/A |
6.2. NFC Function
NFC connection is supported in RX mode (Bluetooth reception) for mobile phones or tablets with NFC functionality.
- Ensure NFC is enabled on your mobile phone or other device.
- Bring the NFC sensing area of your mobile phone close to the NFC sensing area of the M9/M9 Pro Bluetooth adapter (zero distance) for approximately 2 seconds.
- When the NFC connection window pops up on your phone, click 'Connect'. (If a verification code is requested, enter "0000".)
Image demonstrating the NFC one-touch connection process with a smartphone.
6.3. FM Radio Function (M9 Pro Only)
The M9 Pro model has a built-in FM radio. After connecting the FM antenna, you can search, store, and play radio stations. The frequency range is 87.5-108MHz.
Radio Operating Instructions:
- In Bluetooth receiving or transmitting mode, click the 'M' button to switch to FM radio. The default display frequency will be 87.5.
- Double click the 'Play/Pause' button to enter automatic search. Searched channels will be stored (e.g., P1/P2/P3) and played automatically.
- Use the 'Previous Song' or 'Next Song' buttons to switch between stored stations.
- Long press the 'Play/Pause' button to enter manual frequency modulation.
Tips for FM Radio:
- For best reception, connect the FM antenna and extend it to its maximum length. Position the device in an open area and rotate the antenna as needed.
- The number of receivable stations and signal quality may vary by region.
Image highlighting the integrated FM radio feature and its frequency display.
6.4. Microphone Function
The product is equipped with a 6.5mm microphone interface and an anti-howling circuit design. You can insert a microphone to sing in any mode (Bluetooth receiving or transmitting).
- After inserting the microphone, long press the 'Previous Song' button to decrease microphone input volume (MIC Vol-).
- Long press the 'Next Song' button to increase microphone input volume (MIC Vol+).
- The remote control can also be used to adjust microphone volume, song switching, and other operations.
Image illustrating the microphone support feature for karaoke.
6.5. Remote Control Operation
The included infrared remote control allows for convenient operation of various functions. The remote control distance is approximately 5-8 meters.
Image of the infrared remote control, showing its buttons and functions.
Important: The remote control does NOT support the power-on function of the device.
Functions controllable by remote include:
- Power off (but not power on)
- Mute
- Mode switching (BT, USB, TF, FM, COA, AUX)
- Volume adjustment (VOL+, VOL-)
- Previous/Next song
- Play/Pause
- Microphone volume adjustment (MIC+, MIC-)
- Echo volume adjustment (ECH+, ECH-)
- Song number selection (0-9)
- FM station switching/frequency adjustment
- Fast forward/rewind (for USB/TF card playback)
6.6. Display Status Description
| Display Text | Description |
|---|---|
| RX | Receive Mode |
| TX | Transmit Mode |
| BLUE | Bluetooth Mode |
| AUX | AUX Input |
| FM | FM Radio Mode |
| USB | USB Disk Playback |
| TF | TF Card Playback |
| 87.5 - 108 | FM Frequency |
| PRUS | Pause |
| U 0-30 | Volume Level |
| C 0-30 | MIC Volume Level |
| 05:30 | Playtime |
| ON | Power On |
| P1/P2 | FM Station Number |
| 1/2/3 | Song Number |
| Indicator Status | Description |
|---|---|
| ON Bright | Power On |
| ON Off | Power Off |
| RX Flash | RX Mode, Pairing |
| RX Bright | RX Mode, Paired |
| TX Flash | TX Mode, Connecting |
| TX Bright | TX Mode, Connected |
Note: When charging, the "ON" indicator light is red, and it turns off when fully charged.
7. Troubleshooting
If you encounter any issues, try the following solutions. If problems persist, contact customer service.
- Device display not lighting up: Check if the Type-C charging cable is properly connected and if the battery is charged.
- Unable to enter receive/transmit mode: Long press the 'M' button to switch between modes. The device has mode memory.
- Cannot connect Bluetooth device (e.g., headset): Close the Bluetooth adapter, restart the Bluetooth headset, and try connecting again. If unsuccessful, power off both the adapter and the Bluetooth headset, then restart them to ensure they are in pairing mode.
- No sound output:
- Verify the 3.5mm audio cable is correctly connected.
- In TX mode, ensure the cable is plugged into the audio output interface of the source device.
- In RX mode, ensure the cable is plugged into the audio input interface of the target device.
- Check if the current signal source is correct. If not, click 'M' to switch to the correct signal source.
- USB flash disk or TF card cannot be read: Ensure the media contains music files in a supported format and that the signal source is correctly selected.
- FM radio not working (M9 Pro only):
- Confirm the current signal source is FM.
- Ensure the FM antenna is connected and has good signal reception.
- Double click the 'Play/Pause' button to automatically search for stations.
- Bluetooth transmission delay: The device is equipped with Bluetooth 5.1 chip designed for low latency. Ensure no significant obstacles are between the adapter and the connected device, and that both devices support Bluetooth 5.1 for optimal performance.
8. User Tips
- Battery Status: The LED display shows the battery status, allowing you to monitor charge levels.
- Remote Control Power: Remember that the remote control can turn off the device but cannot power it on. Use the main volume knob to power on.
- Pairing with Passcodes: The adapter is designed for automatic pairing. If a Bluetooth speaker requires a passcode, ensure it's in a discoverable mode that doesn't require manual entry, or try resetting the speaker's pairing history.
- Simultaneous Functions: Bluetooth and FM transmission/reception are not designed to be used simultaneously. You must switch between modes using the 'M' button.
- Tone Controls: The bass and treble adjustment knobs are active in both Bluetooth receiving and transmitting modes, allowing you to fine-tune the audio output.
- Multiple Bluetooth Devices: The adapter typically connects to one Bluetooth receiving device (e.g., headphones) or one Bluetooth transmitting device (e.g., phone) at a time.
- Voice Prompts: The device provides voice prompts when switching signal sources, indicating the current mode.
- Car Use: This device can be used in a car, connecting to the car's AUX input for Bluetooth audio or transmitting to a car's FM radio (M9 Pro).
9. Safety Warnings
- This product is supplied by standard 5V±5% power. Using power outside this voltage range may damage the device and pose safety risks.
- The device is intended for use in areas with an altitude of 2000m and below, and in non-tropical climate conditions.
- Do not use this product near magnets or products with strong magnetic fields, as this may affect its normal functions or cause damage.
- Avoid dropping or strongly hitting the product; rough handling may cause damage.
- Do not use this product in extremely high or low temperatures, damp, or corrosive environments.
- This product has a built-in lithium battery. Do not discard it, throw it into water or fire, or expose it to direct sunlight, fire, or similar overheated environments.
10. Warranty and Support
This product comes with a 3-year quality assurance service. For any issues not resolved by the troubleshooting guide, or for further assistance, please contact your dealer or customer service. Do not attempt to disassemble or repair the device yourself, as this may void the warranty and prevent return/replacement.