1. Introduction
The Bluedio U (UFO) Faith Series headphones are designed to deliver a high-fidelity audio experience through advanced acoustic technology and robust construction. Featuring Bluedio's exclusive PPS 8 technology, a built-in 3D DSP processor, and 24-bit high-speed signal processing, these headphones aim for detailed and immersive sound. Crafted from Al-Ti alloy, they offer durability with a lightweight design. Equipped with Bluetooth 4.1, they provide extended battery life for continuous music playback.

Image: Bluedio U (UFO) Faith Series Bluetooth Headphones, showcasing their black and red design.
2. Package Contents
Verify that all items are present in your Bluedio U (UFO) Faith Series headphone package:
- Bluedio U (UFO) Faith Series Bluetooth Headphones
- Carrying Case
- USB Charging Cable
- 3.5mm Audio Cable
- User Manual (this document)

Image: The complete package contents for the Bluedio U (UFO) Faith Series headphones.
3. Product Overview
Familiarize yourself with the various components and controls of your Bluedio U (UFO) headphones:

Image: Detailed diagram of the headphone controls and ports.
- Multi-Function (MF) Button: Power on/off, play/pause, answer/end calls.
- Volume Up (+) Button: Increase volume.
- Volume Down (-) Button: Decrease volume.
- Next Track (>) Button: Skip to the next song.
- Previous Track (<) Button: Go to the previous song.
- LED Indicator: Displays status (power, pairing, charging).
- Microphone: For hands-free calls.
- Micro USB Charging Connector: For charging the headphones.
- 3.5mm Audio Jack: For wired connection.
PPS 8 Exclusive Acoustics Technology
The Bluedio U (UFO) headphones incorporate PPS 8 technology, featuring multiple drivers per ear cup to reproduce a wide frequency range with clarity and depth. This design aims to deliver a balanced and immersive audio experience.

Image: Internal diagram of the PPS 8 multi-driver acoustic system.
4. Setup
4.1. Charging the Headphones
- Connect the Micro USB end of the charging cable to the Micro USB port on the headphones.
- Connect the standard USB end of the cable to a USB power adapter (not included) or a computer's USB port.
- The LED indicator will show a solid red light during charging.
- Once fully charged (approximately 3 hours), the red LED will turn off.
A full charge provides up to 25 hours of music playback.
4.2. Bluetooth Pairing
- Ensure the headphones are powered off.
- Press and hold the Multi-Function (MF) button for approximately 5-7 seconds until the LED indicator blinks blue rapidly and you hear the voice prompt "pairing".
- Activate Bluetooth on your audio device (e.g., smartphone, tablet, computer).
- Search for and select "Bluedio U" from the list of available Bluetooth devices.
- Once successfully paired, the LED indicator will blink blue slowly, and you will hear a confirmation tone.
The headphones can connect to two Bluetooth devices simultaneously. To switch between devices, pause playback on the first device and start playback on the second.
5. Operating Instructions
5.1. Power On/Off
- Power On: Press and hold the MF button for approximately 3 seconds until the LED indicator lights up blue and you hear "power on".
- Power Off: Press and hold the MF button for approximately 3 seconds until the LED indicator turns off and you hear "power off".
5.2. Music Playback
- Play/Pause: Press the MF button once.
- Volume Up: Press the "Vol+" button.
- Volume Down: Press the "Vol-" button.
- Next Track: Press the "Next Track" (>) button.
- Previous Track: Press the "Previous Track" (<) button.
5.3. Call Management
- Answer/End Call: Press the MF button once.
- Reject Call: Press and hold the MF button for approximately 2 seconds.
- Redial Last Number: Double-press the MF button.
5.4. 3D Surround Sound Effect
To enhance your listening experience, the Bluedio U (UFO) headphones feature a 3D surround sound effect:
- Activate/Deactivate: Press and hold the "Next Track" (>) button for approximately 2 seconds. You will hear an audible prompt indicating the status change.
5.5. Wired Connection
To use the headphones with a wired connection, insert the 3.5mm audio cable into the audio jack on the headphones and the other end into your audio source. Note that some headphone functions, such as the built-in microphone and control buttons, may be disabled when using a wired connection.

Image: Bluedio U (UFO) headphones connected to a device using the 3.5mm audio cable.
6. Maintenance
Proper care will extend the life and performance of your headphones:
- Clean the headphones regularly with a soft, dry, lint-free cloth.
- Avoid using harsh chemicals, cleaning solvents, or strong detergents.
- Do not expose the headphones to extreme temperatures, direct sunlight, or high humidity.
- Keep the headphones away from water and other liquids. While they are water-resistant, they are not waterproof.
- Store the headphones in their protective carrying case when not in use to prevent damage.
- Avoid dropping or subjecting the headphones to strong impacts.
7. Troubleshooting
If you encounter issues with your Bluedio U (UFO) headphones, refer to the following common solutions:
| Problem | Possible Solution |
|---|---|
| Headphones do not power on. | Ensure the headphones are fully charged. Connect them to a power source using the USB charging cable. |
| Cannot pair with a Bluetooth device. |
|
| No sound or low volume. |
|
| Sound is distorted or unclear. |
|
| Microphone not working during calls. |
|
8. Specifications
| Feature | Detail |
|---|---|
| Model | U |
| Bluetooth Version | 4.1 |
| Frequency Range | 5Hz-25000kHz |
| Impedance | 32 Ohm |
| Charging Time | Approximately 3 Hours |
| Music Playtime | Up to 25 Hours |
| Connectivity | Bluetooth, 3.5mm Audio Jack |
| Weight | 0.35 Kilograms |
| Material | Aluminum |
| Noise Control | Active Noise Cancellation |
| Water Resistance Level | Water Resistant |
9. Warranty and Support
For detailed warranty information, product registration, and technical support, please visit the official Bluedio website or contact their customer service department. Keep your purchase receipt as proof of purchase for warranty claims.




