PTHTECHUS M91
PTHTECHUS Wireless Open-Ear Clip Headphones User Manual
Model: M91
Introduction
Thank you for choosing the PTHTECHUS M91 Wireless Open-Ear Clip Headphones. These innovative headphones are designed to provide a comfortable and safe listening experience with their unique open-ear clip design, allowing you to stay aware of your surroundings while enjoying high-quality audio. Featuring advanced Bluetooth 5.4 connectivity, directional sound transmission, and long-lasting battery life, the M91 is perfect for various activities, from daily commutes to sports and business calls.

Image: The PTHTECHUS M91 headphones, black, resting in their sleek, grey charging case. The case is open, revealing both earbuds.
Product Features
- Open-Ear Clip Design: Secure and comfortable fit that doesn't block your ear canal, ensuring awareness of ambient sounds and preventing ear fatigue.
- Directional Sound Transmission: Advanced technology that focuses sound waves towards your ear, significantly reducing sound leakage by up to 89% and enhancing privacy.
- Crystal Clear Calls (ENC): Equipped with Environmental Noise Cancellation (ENC) for clear voice transmission during calls, even in noisy environments.
- Bluetooth 5.4 Connectivity: Provides stable, interference-free transmission with a range of up to 10 meters. Supports automatic connection to previously paired devices.
- Extended Battery Life: Enjoy up to 30 hours of playback on a single charge (with charging case) and an impressive standby time of up to 90 days.
- Intelligent Touch Control: Easy management of music playback, calls, and voice assistant with intuitive touch gestures.
- Lightweight and Durable: Weighing only 2 grams per earbud, made from plastic, silicone, and nickel-titanium for comfort and resilience. Water-resistant with IPX5 rating.

Image: An exploded view diagram of the earbud, highlighting internal components responsible for sound enhancement and immersive quality, with text indicating "Bass boost 57%" and "Overall effect improvement 80%".

Image: A diagram showing an ear with the earbud in place, illustrating how sound waves are directed into the ear canal to protect privacy, labeled "Directional transmission Protecting privacy".
Setup
1. Initial Charge
Before first use, fully charge your PTHTECHUS M91 headphones and their charging case. Connect the charging case to a USB power source using the provided USB-C cable. The indicator light on the case will show charging status and turn off or change color when fully charged. A full charge takes approximately 1 hour.
2. Pairing with Your Device
- Ensure the headphones are in the charging case and the case has power.
- Open the charging case. The headphones will automatically enter pairing mode.
- On your mobile phone, laptop, or tablet, go to the Bluetooth settings.
- Search for new devices and select "PTHTECHUS M91" from the list of available devices.
- Once connected, you will hear a confirmation tone, and the headphones will be ready for use.
The headphones will automatically reconnect to the last paired device when taken out of the case, provided Bluetooth is enabled on your device.

Image: The PTHTECHUS M91 headphones and their charging case, with icons representing mobile phones, laptops, and tablets, illustrating intelligent connection and compatibility with various devices.
Operating Instructions
Wearing the Headphones
Gently clip the headphones onto your ear, ensuring the sound outlet is positioned correctly for optimal audio transmission. The open-ear design allows for a comfortable and secure fit without inserting into the ear canal.

Image: A person wearing the PTHTECHUS M91 headphones, demonstrating their lightweight and comfortable fit, with text "Lightweight fit to the ears Your exclusive care".
Touch Controls
The PTHTECHUS M91 headphones feature intuitive touch controls on each earbud. Refer to the diagram below for specific functions:

Image: A detailed diagram illustrating the touch control functions on the earbuds. It shows icons and descriptions for actions like playing/pausing music, skipping tracks, adjusting volume, answering/ending calls, and activating the voice assistant.
- Play/Pause: Double-click either earbud.
- Next Song: Long press the right earbud.
- Previous Song: Long press the left earbud.
- Volume Up/Down: Long press either earbud.
- Answer/Hang Up Call: Double-click either earbud.
- Reject Call: Long press either earbud during an incoming call.
- Activate Voice Assistant: Triple-click either earbud.
Maintenance
- Cleaning: Use a soft, dry, lint-free cloth to clean the earbuds and charging case. Do not use abrasive cleaners, alcohol, or chemical sprays.
- Storage: When not in use, store the headphones in their charging case to protect them from dust and damage. Store in a cool, dry place away from direct sunlight and extreme temperatures.
- Water Resistance: The headphones are IPX5 water-resistant, meaning they can withstand splashes and sweat. Do not submerge them in water or expose them to heavy rain. Dry them thoroughly before placing them back in the charging case if they get wet.
- Battery Care: To prolong battery life, avoid fully discharging the headphones frequently. Charge them regularly, even if not used for extended periods.
Troubleshooting
| Problem | Possible Solution |
|---|---|
| Headphones do not turn on. | Ensure the charging case and headphones are fully charged. Place headphones in the case and close it, then open again. |
| Cannot pair with device. |
|
| No sound or low volume. |
|
| Sound cutting in and out. |
|
| Touch controls not responding. |
|
Specifications
| Feature | Detail |
|---|---|
| Model | M91 |
| Brand | PTHTECHUS |
| Connectivity Technology | Wireless (Bluetooth 5.4) |
| Wireless Range | Up to 10 meters |
| Battery Life (Playback) | Up to 30 hours (with charging case) |
| Standby Time | Up to 90 days |
| Charging Time | Approx. 1 hour (for full charge) |
| Weight (per earbud) | 2 grams |
| Water Resistance Level | IPX5 (Water-resistant) |
| Control Type | Touch Control |
| Compatible Devices | Mobile phones, Laptops, Tablets |
| Material | Plastic, Silicone, Nickel-titanium |
| Frequency Response | 20 Hz - 20,000 Hz (20 KHz) |
| Special Features | Open Design, ENC (Environmental Noise Cancellation) |
Warranty and Support
For warranty information and customer support, please refer to the documentation included with your purchase or visit the official PTHTECHUS website. If you encounter any issues not covered in this manual, please contact PTHTECHUS customer service for assistance.
Contact Information: Please refer to the product packaging or the official PTHTECHUS brand store on Amazon for the most up-to-date support contact details.
Link to PTHTECHUS Store: PTHTECHUS Official Store
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