Langsdom Theta Pro Wireless Earphones User Manual

1. Introduction

Thank you for choosing the Langsdom Theta Pro Wireless Earphones. These earbuds are designed to provide a superior audio experience with features like active noise cancellation, ultra-low latency for gaming, and extended battery life. This manual will guide you through the setup, operation, and maintenance of your new earphones.

2. Package Contents

Please check the package for the following items:

Langsdom Theta Pro Wireless Earbuds (Left and Right)
Charging Case
USB-C Charging Cable
User Manual
Multiple sizes of Ear Tips

Langsdom Theta Pro Package Contents — Figure 2.1: Contents of the Langsdom Theta Pro package, including earbuds, charging case, cable, manual, and ear tips.

3. Specifications

Feature	Specification
Brand	Langsdom
Model	Theta Pro
Wireless Type	Bluetooth
Bluetooth Version	V5.3
Transmission Range	10 meters
Earbud Battery Capacity	40mAh * 2
Charging Case Battery Capacity	400mAh
Total Play Duration	Up to 30 hours (with charging case)
Single Earbud Play Duration	Up to 7.5 hours
Charging Duration	Approximately 1 hour
Charging Voltage	DC5V
Frequency Response Range	20Hz - 20KHz
Horn Size (Driver)	Φ10mm
Vocalism Principle	Dynamic
Active Noise-Cancellation	Yes
Control Button	Yes
Volume Control	Yes
Material	Plastic
Certification	CE
Origin	Mainland China

10mm Custom High Sensitive Composite Diaphragm — Figure 3.1: Illustration of the 10mm custom high-sensitive composite diaphragm for excellent tri-band sound quality.

4. Setup

4.1 Charging the Earphones and Case

Before first use, fully charge your Langsdom Theta Pro earphones and charging case.

Place both earbuds into the charging case.
Connect the USB-C charging cable to the charging port on the case and the other end to a DC5V power source (e.g., a USB wall adapter or computer USB port).
The indicator light on the charging case will show the charging status. A full charge typically takes about 1 hour.
Once fully charged, disconnect the charging cable.

The charging case provides multiple charges for the earbuds, offering up to 30 hours of total play duration. Each earbud can provide up to 7.5 hours of playback on a single charge.

Langsdom Theta Pro Charging and Battery Life — Figure 4.1: Visual representation of the 30-hour total battery life and 7.5-hour single earbud battery life.

4.2 Pairing with a Device

The Langsdom Theta Pro earphones use Bluetooth 5.3 for a stable and continuous connection.

Open the charging case. The earbuds will automatically enter pairing mode (indicated by flashing LED lights on the earbuds).
On your device (smartphone, tablet, computer), enable Bluetooth.
Search for "Langsdom Theta Pro" in the list of available Bluetooth devices.
Select "Langsdom Theta Pro" to connect. Once connected, the earbud indicator lights will stop flashing.
If pairing fails, place the earbuds back into the case, close the lid, wait a few seconds, and then repeat the steps.

Bluetooth 5.3 Connectivity — Figure 4.2: Diagram illustrating the upgraded dual-mode Bluetooth 5.3 for stable and anti-interference connection.

5. Operating Instructions

5.1 Wearing the Earbuds

The earbuds feature a 3.6g lightweight design and a 30-degree tilt for comfortable and secure wear. Choose the ear tips that best fit your ears for optimal sound quality and comfort.

Ergonomic Earbud Design — Figure 5.1: Image demonstrating the lightweight and ergonomically tilted design for comfortable wear.

5.2 Basic Controls

The Theta Pro earbuds are equipped with touch-sensitive control buttons. Specific functions may vary slightly depending on your device and application, but common controls include:

Play/Pause: Single tap on either earbud.
Next Track: Double tap on the right earbud.
Previous Track: Double tap on the left earbud.
Answer/End Call: Single tap on either earbud.
Reject Call: Press and hold on either earbud.
Activate Voice Assistant: Triple tap on either earbud (if supported by your device).
Volume Control: Press and hold the right earbud to increase volume, press and hold the left earbud to decrease volume (or as per specific model instructions).

5.3 Special Features and Modes

Active Noise Cancellation (ANC): The earbuds feature active noise cancellation to reduce ambient sounds. Refer to the user manual for specific gestures to activate/deactivate ANC.
Intelligent Call Noise Reduction (ENC): Built-in ENC technology effectively shields environmental noise for clear voice calls, making conversations as clear as face-to-face.
Low Latency Gaming Mode: The Theta Pro offers an ultra-low latency of 45ms, ensuring sound and picture synchronization for competitive gaming. This mode can typically be activated via a specific touch gesture (e.g., triple tap or long press).
Game/Music Dual Mode Sound: Switch between optimized sound profiles for gaming and music listening.

45ms Ultra-Low Latency for Gaming — Figure 5.2: Explanation of the 45ms ultra-low latency feature, utilizing LSD2.0 algorithm for synchronized audio and video in games.

Intelligent Call Noise Reduction — Figure 5.3: Diagram highlighting the intelligent call noise reduction (ENC) technology for clear communication.

6. Maintenance

To ensure the longevity and optimal performance of your Langsdom Theta Pro earphones, follow these maintenance guidelines:

Cleaning: Regularly clean the earbuds and charging case with a soft, dry, lint-free cloth. Do not use harsh chemicals or abrasive materials. Gently clean the ear tips and speaker mesh to prevent wax buildup.
Storage: When not in use, store the earbuds in their charging case to protect them from dust, dirt, and damage.
Avoid Water: The earphones are not waterproof. Avoid exposure to water, moisture, or excessive humidity.
Temperature: Do not expose the earphones to extreme temperatures (hot or cold) as this can damage the battery and internal components.
Charging: Use only the provided USB-C cable or a certified equivalent for charging.

7. Troubleshooting

Problem	Possible Solution
Earbuds not pairing	Ensure earbuds are charged. Place earbuds back in the case, close, then reopen to re-enter pairing mode. Turn off and on Bluetooth on your device. Forget "Langsdom Theta Pro" from your device's Bluetooth list and try pairing again.
No sound from earbuds	Check device volume and earbud volume. Ensure earbuds are properly connected to your device. Try playing audio from a different application or source. Re-pair the earbuds with your device.
Charging case not charging	Ensure the USB-C cable is securely connected to both the case and the power source. Try a different USB-C cable or power adapter. Check if the power source is active.
Poor sound quality	Ensure earbuds are clean and free of debris. Try different sized ear tips for a better seal. Move closer to your connected device to avoid interference. Check audio settings on your device.

8. User Tips

While no specific user reviews or Q&A were provided, here are some general tips for optimizing your experience with the Langsdom Theta Pro earphones:

Optimal Fit: Experiment with the included ear tip sizes to find the best fit. A good seal is crucial for effective noise cancellation and rich bass response.
Gaming Performance: For the best gaming experience, ensure your device is close to the earbuds to maintain the ultra-low latency connection.
Battery Management: Regularly place the earbuds back into the charging case when not in use to maximize their battery life and ensure they are always ready.
Firmware Updates: Check the manufacturer's website periodically for any available firmware updates, which can improve performance and add new features.

9. Warranty and Support

Langsdom products are manufactured to high-quality standards. For warranty information, technical support, or service inquiries, please refer to the contact information provided with your purchase or visit the official Langsdom website. Keep your proof of purchase for warranty claims.

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