1. Product Overview
The Muzen OTR Metal Retro Bluetooth Speaker is a versatile audio device designed with a classic 1960s aesthetic, combining modern technology with vintage charm. It offers multiple connectivity options including FM radio, Bluetooth, and AUX input, providing a rich audio experience in a compact and portable form factor.
Crafted with a durable metal lacquer finish, this speaker is built for longevity and features a high-fidelity full-range speaker for warm and full sound. Its integrated 1000mAh rechargeable battery ensures extended playtime, making it suitable for various indoor and outdoor settings.

Figure 1.1: Muzen OTR Metal Retro Bluetooth Speaker, its carrying case, and included accessories.
2. What's in the Box
- Muzen OTR Metal Retro Bluetooth Speaker
- FM Antenna
- USB Charging Cable
- AUX Cable
- Decorative Stickers
- User Manual/Documentation
- Retro-style Carrying Suitcase

Figure 2.1: Contents of the Muzen OTR Metal Retro Bluetooth Speaker package.
3. Setup
3.1 Initial Charging
Before first use, fully charge the speaker using the provided USB charging cable. Connect the micro-USB end to the speaker's charging port and the USB-A end to a compatible USB power source (e.g., computer USB port, wall adapter). The charging indicator light will show charging status.
3.2 Antenna Installation (for FM Radio)
For optimal FM radio reception, attach the included external antenna. Locate the antenna port on the back of the speaker and gently insert the antenna connector. Extend the telescopic antenna for improved signal strength.
4. Operating Instructions
4.1 Power On/Off
To power on the speaker, rotate the rightmost knob clockwise until you hear a click and the indicator light illuminates. To power off, rotate the same knob counter-clockwise until it clicks off.
4.2 Volume Control
Adjust the volume by rotating the leftmost knob. Rotate clockwise to increase volume and counter-clockwise to decrease volume.
4.3 Mode Selection
The speaker supports three modes: FM Radio, Bluetooth, and AUX. Switch between modes by rotating the middle knob. The indicator light will change color or display to indicate the active mode.
4.4 Bluetooth Pairing
- Turn on the speaker and switch to Bluetooth mode. The indicator light will blink, indicating it's in pairing mode.
- Enable Bluetooth on your smartphone, tablet, or other audio device.
- Search for "Muzen OTR" in the list of available devices and select it to pair.
- Once successfully paired, the indicator light will become solid, and you can begin playing audio wirelessly.

Figure 4.1: Bluetooth 5.0 High-Speed Connection.
4.5 FM Radio Operation
- Ensure the FM antenna is properly installed and extended.
- Switch the speaker to FM Radio mode.
- Rotate the tuning dial (the large circular dial) to scan for available FM stations. The dial will illuminate to assist with tuning.

Figure 4.2: FM Radio & Bluetooth Speaker 2 in 1.
4.6 AUX Input
To connect an external audio source (e.g., MP3 player, PC, TV) via AUX, use the provided AUX cable. Plug one end into the speaker's AUX port and the other end into your audio source's headphone jack or AUX output. Switch the speaker to AUX mode to play audio.
5. Maintenance
- Keep the speaker dry and away from excessive moisture or humidity.
- Clean the speaker's surface with a soft, dry cloth. Avoid using harsh chemicals or abrasive cleaners.
- Store the speaker in its provided carrying suitcase when not in use to protect it from dust and scratches.
- Avoid exposing the speaker to extreme temperatures (hot or cold) as this can affect battery life and internal components.
6. Troubleshooting
6.1 No Power
- Ensure the speaker is fully charged. Connect it to a power source and allow it to charge for at least 30 minutes before attempting to power on again.
- Check if the power knob is fully rotated to the 'ON' position.
6.2 No Sound
- Increase the volume on both the speaker and your connected audio device.
- If using Bluetooth, ensure the speaker is correctly paired and within range (up to 33 feet). Try unpairing and re-pairing the device.
- If using AUX, ensure the cable is securely connected to both the speaker and the audio source, and the speaker is in AUX mode.
- If using FM Radio, ensure the antenna is extended and try adjusting its position or the speaker's location for better reception.
6.3 Poor FM Reception
- Fully extend the telescopic antenna.
- Try repositioning the speaker or the antenna to find a clearer signal.
- Avoid placing the speaker near other electronic devices that may cause interference.
7. Specifications
| Feature | Detail |
|---|---|
| Model Number | MW-2AI |
| Product Dimensions | 3.72 x 2.21 x 2.84 inches |
| Item Weight | 15.4 ounces (436 Grams) |
| Battery | 1 A battery required (included) |
| Connectivity Technology | Bluetooth |
| Tuner Technology | FM |
| Power Source | Battery Powered |
| Radio Bands Supported | FM |
| Color | Light Blue |
8. Warranty and Support
For warranty information or technical support, please refer to the documentation included in your product package or visit the official Muzen website. You may also contact the seller directly for assistance.





