M29 Bluetooth Portable Voice Amplifier

1. Introduction

Thank you for choosing the kebidumei M29 Bluetooth Portable Voice Amplifier. This device is designed to provide clear and powerful sound amplification, making it ideal for teachers, tour guides, coaches, and anyone needing to project their voice effectively. Featuring intelligent anti-howling technology, long-lasting battery life, and versatile connectivity options, the M29 ensures a comfortable and efficient user experience.

2. Product Overview

2.1 Components

• Main Unit (Loudspeaker): The primary amplification device with integrated speaker, controls, and display.
• Wireless Lavalier Microphone: A compact, clip-on microphone for hands-free voice input.
• Type-C Charging Cable: For recharging the device.
• Adjustable Lanyard: For convenient carrying options (shoulder, diagonal, waist).

2.2 Key Features

• Intelligent Anti-Whistling: Utilizes a DSP intelligent noise reduction chip for automatic detection and suppression of howling feedback, ensuring clear sound even in large spaces.
• Long-lasting Battery Life: Equipped with a large-capacity battery and Type-C charging interface, offering up to 25 hours of operation. Includes a power display for monitoring battery level.
• Bluetooth 5.3 Connectivity: Seamlessly connects to laptops, computers, tablets, mobile phones, and other Bluetooth-enabled devices for audio playback.
• USB-A Port: Allows playback of audio files directly from a USB flash drive, providing multi-purpose functionality.
• Decompression Knob Type Encoder Switch: Offers 16 levels of volume adjustment for precise control.
• Magnetic Hidden Integrated Design: The microphone can be magnetically stored on the back of the main unit for convenience and to prevent loss.
• Compact and Portable: Lightweight and ergonomically designed for easy one-hand carrying or wearing with the adjustable lanyard.
• Electret Single Directional Microphone Head: Provides clear sound pickup, high sensitivity, and low distortion, effectively reducing environmental noise.
• Anti-interference Internal Magnetic Horn: Features a 76mm rare earth magnet horn for loud, penetrating, and high-fidelity sound amplification without distortion or whistling.

Figure 1: M29 Bluetooth Portable Voice Amplifier with power display and microphone storage slots.

Figure 2: Rear view of the amplifier illustrating the magnetic hidden integrated design for microphone storage.

3. Setup

3.1 Charging the Device

1. Connect the provided Type-C charging cable to the charging port on the voice amplifier.
2. Connect the other end of the cable to a compatible USB power adapter (not included) or a computer USB port.
3. The power display will indicate charging status. Ensure the device is fully charged before first use for optimal battery life.

3.2 Attaching the Microphone

1. Locate the wireless lavalier microphone.
2. The main unit features a magnetic area on the back for storing the microphone. When in use, simply detach the microphone.
3. Clip the lavalier microphone to your clothing, ensuring it is positioned close to your mouth for best sound pickup.

3.3 Power On/Off

Press and hold the power button (usually marked 'M' or a power icon) on the main unit to turn the device on or off. The display will light up upon powering on.

3.4 Wearing the Amplifier

Attach the adjustable lanyard to the designated loops on the amplifier. You can wear it around your neck, over your shoulder, diagonally across your body, or clip it to your waist for hands-free operation.

Figure 3: The compact design allows for easy one-hand carrying.

4. Operating Instructions

4.1 Voice Amplification

1. Ensure both the main unit and the wireless lavalier microphone are powered on.
2. Speak clearly into the lavalier microphone. Your voice will be amplified through the main unit's speaker.
3. Adjust the volume using the encoder switch knob on the main unit. Rotate clockwise to increase volume, counter-clockwise to decrease. There are 16 levels of adjustment for fine-tuning.

Figure 4: Decompression knob type encoder switch for precise volume control.

4.2 Bluetooth Audio Playback

1. Power on the M29 amplifier.
2. Activate Bluetooth on your external device (e.g., smartphone, tablet, laptop).
3. Search for available Bluetooth devices and select "M29" (or similar name) to pair.
4. Once paired, you can play audio from your device, and it will be output through the M29 speaker.

Figure 5: Bluetooth connection allows playback from various compatible devices.

4.3 USB Flash Drive Playback

1. Insert a USB flash drive containing MP3 audio files into the USB-A port on the M29 amplifier.
2. The amplifier should automatically detect the USB drive and begin playing audio.
3. Use the control buttons on the amplifier (if available, typically for track navigation or play/pause) to manage playback.

Figure 6: The USB-A port enables direct playback from a USB flash drive.

5. Maintenance

5.1 Cleaning

• Wipe the device with a soft, dry cloth.
• Do not use abrasive cleaners, solvents, or strong chemicals, as these may damage the surface.
• Keep the speaker grille free from dust and debris.

5.2 Storage

• When not in use, store the amplifier and microphone in a cool, dry place.
• Utilize the magnetic storage feature on the main unit to secure the lavalier microphone and prevent loss.
• Avoid exposing the device to extreme temperatures, humidity, or direct sunlight.

5.3 Battery Care

• Recharge the battery regularly, even if the device is not used frequently, to maintain battery health.
• Avoid completely draining the battery before recharging.
• If storing for an extended period, charge the battery to approximately 50% and recharge every few months.

6. Troubleshooting

6.1 No Sound from Amplifier

• Ensure the amplifier is powered on and the battery is charged.
• Check that the wireless microphone is paired and powered on.
• Increase the volume using the encoder switch.
• If using Bluetooth, ensure the device is correctly paired and playing audio.
• If using a USB drive, ensure it is properly inserted and contains compatible MP3 files.

6.2 Howling or Feedback Noise

• Move the microphone further away from the speaker.
• Reduce the volume level.
• Ensure the microphone is not pointing directly at the speaker.
• The M29 features intelligent anti-howling technology, but extreme conditions may still cause feedback.

Figure 7: Intelligent anti-whistling technology reduces noise for clearer sound.

6.3 Bluetooth Connection Issues

• Ensure the M29 is in pairing mode (refer to device display for indicators).
• Turn off and on Bluetooth on your external device.
• Move your external device closer to the M29 amplifier.
• Clear previous Bluetooth pairings on your external device and try pairing again.

6.4 Battery Not Charging or Short Battery Life

• Verify the Type-C charging cable is securely connected to both the amplifier and the power source.
• Try a different USB power adapter or USB port.
• Ensure the power source is providing sufficient power.
• Battery life can vary based on usage (e.g., high volume, continuous playback).

7. Specifications

8. User Tips

• Microphone Placement: For optimal sound clarity and to minimize feedback, position the lavalier microphone about 6-8 inches from your mouth.
• Volume Control: Utilize the 16-level encoder switch for precise volume adjustments, especially in different acoustic environments, to prevent sudden loud noises or feedback.
• Battery Monitoring: Regularly check the power display to avoid unexpected power loss during important presentations or tours. Recharge promptly when the indicator is low.
• Versatile Use: Don't forget the USB-A port! It's great for playing background music or pre-recorded messages during your sessions.
• Magnetic Storage: Always use the magnetic storage feature for the microphone when not in use. This keeps it secure and prevents misplacement.
• Number of Microphones: The product includes one wireless lavalier microphone. While the main unit may have space for two, only one is provided in the standard package.

9. Warranty and Support

For warranty information, technical support, or service inquiries, please contact the seller or manufacturer directly. Keep your purchase receipt as proof of purchase.