1. Introduction
Thank you for choosing the MEGUO A66 Portable Bluetooth Speaker. This manual provides essential information for setting up, operating, and maintaining your speaker to ensure optimal performance and longevity. The A66 speaker delivers 5W clear sound with two passive bass diaphragms and colorful lighting, all within a compact and portable design.
2. Product Overview
2.1 Package Contents
- MEGUO A66 Bluetooth Speaker
- USB Type-C Charging Cable
- User Manual
2.2 Speaker Components and Controls
Familiarize yourself with the speaker's layout and functions:

Image: The MEGUO A66 speaker displaying its control buttons (Power, Play/Pause, Volume Up/Next, Volume Down/Previous, Mode) and input ports (TF card slot, USB flash-disk port, 3.5mm AUX input, Type-C charging port).
- Power Button: Long press to power on/off.
- Play/Pause Button: Press to play or pause audio.
- Volume Up / Next Track Button: Short press for volume up, long press for next track.
- Volume Down / Previous Track Button: Short press for volume down, long press for previous track.
- Mode (M) Button: Press to switch between playing modes (Bluetooth, TF Card, USB, AUX). Long press to turn the colorful light on/off.
- TF Card Slot: For playing music from a Micro SD/TF card (supports WAV/MP3 format).
- USB Flash-Disk Port: For playing music from a USB drive.
- 3.5mm AUX Input Port: For wired audio connection.
- Type-C Charging Port: For charging the speaker.
3. Setup
3.1 Charging the Speaker
Before first use, fully charge the speaker. Connect the provided Type-C charging cable to the speaker's charging port and the other end to a USB power adapter (not included) or a computer's USB port.
- A charging indicator light will illuminate during charging.
- Charging time is approximately 3 hours.
- A full charge provides up to 10 hours of playtime at 2/3 volume without the light on. Playtime may vary based on volume level, music type, and light usage.

Image: The MEGUO A66 speaker with text indicating 12 hours playtime, 3 hours charging time, and 1200mAh battery capacity.
3.2 Bluetooth Pairing
- Long press the Power button to turn on the speaker. It will automatically enter Bluetooth pairing mode, indicated by a flashing LED light.
- On your device (smartphone, tablet, computer), enable Bluetooth and search for available devices.
- Select "A66" from the list of devices.
- Once connected, the speaker will emit a confirmation sound, and the LED light will stop flashing.
4. Operating Instructions
4.1 Switching Playing Modes
Press the Mode (M) button to cycle through the available playing modes:
- Bluetooth Mode: Connect wirelessly to your Bluetooth-enabled device.
- TF Card Mode: Insert a Micro SD/TF card with WAV/MP3 audio files.
- USB Mode: Insert a USB flash drive with WAV/MP3 audio files.
- AUX Mode: Connect an external audio device using a 3.5mm audio cable (not included).

Image: The MEGUO A66 speaker with visual indicators for Bluetooth, TF card, USB drive, and 3.5mm Aux-in playback modes.
4.2 True Wireless Stereo (TWS) Function
To achieve a louder, stereo sound experience, you can connect two MEGUO A66 speakers wirelessly:
- Ensure both A66 speakers are powered on and in Bluetooth pairing mode (not connected to any device).
- On one of the speakers, long press the Play/Pause button. You will hear a tone indicating that the speakers are attempting to pair with each other.
- Once successfully paired, you will hear a confirmation sound. The LED indicator on one speaker will flash (master), and the other will be solid (slave).
- Now, connect your device to the master speaker (the one with the flashing LED) via Bluetooth as described in section 3.2.
- Audio will now play through both speakers in stereo.

Image: Two MEGUO A66 speakers positioned to illustrate the True Wireless Stereo connection, providing 10W stereo sound.
4.3 Controlling the Colorful Light
The MEGUO A66 speaker features a colorful light effect. To turn the light on or off, long press the Mode (M) button.
5. Maintenance
- Clean the speaker with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Avoid exposing the speaker to extreme temperatures, direct sunlight, or high humidity.
- Store the speaker in a cool, dry place when not in use for extended periods.
- Do not attempt to disassemble or repair the speaker yourself, as this will void the warranty.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Speaker does not power on. | Low battery. | Charge the speaker fully using the provided Type-C cable. |
| Cannot pair via Bluetooth. | Speaker is not in pairing mode or too far from device. | Ensure speaker is in pairing mode (flashing LED). Move speaker closer to your device. Turn off and on Bluetooth on your device. |
| No sound. | Volume too low, incorrect mode, or device not connected. | Increase speaker and device volume. Ensure correct playing mode is selected. Verify Bluetooth connection or AUX cable. |
| TWS pairing fails. | Speakers already connected to other devices. | Ensure both speakers are disconnected from any other Bluetooth devices before attempting TWS pairing. |
| USB/TF card not playing. | Incorrect file format or card/drive not inserted correctly. | Ensure files are WAV/MP3 format. Reinsert the TF card or USB drive. Ensure speaker is in the correct mode. |
7. Specifications
- Model: A66
- Material: Plastic
- Speaker Type: Bluetooth Speaker
- Output Power: 5 Watts
- Connectivity: Bluetooth, Auxiliary (3.5mm), USB, TF Card
- Wireless Technology: Bluetooth
- Audio Output Mode: Stereo (2.0)
- Power Source: Battery Powered
- Battery Type: 1 Lithium Ion (included)
- Battery Capacity: 1200mAh
- Playtime: Up to 10 hours (at 2/3 volume, lights off)
- Charging Time: Approximately 3 hours
- Product Dimensions: 8.5D x 11.6W x 8.5H Centimetres
- Weight: 300g
- Color: Light-black
- Compatible Devices: Smartphone, Laptop, Projector, Desktop, Telephone, MP3 Player, Tablet
8. Warranty and Support
For warranty information and customer support, please refer to the documentation provided with your purchase or contact MEGUO customer service directly. Keep your proof of purchase for warranty claims.