Introduction
Welcome to the PSB Speakers M4U TWM True Wireless Micro Planar Earphones user manual. This guide provides essential information for setting up, operating, maintaining, and troubleshooting your new earphones. Please read this manual thoroughly before use to ensure optimal performance and longevity of your device.
Safety Information
- Do not expose the earphones or charging case to extreme temperatures, humidity, or liquids.
- Avoid dropping or subjecting the device to strong impacts.
- Keep out of reach of children and pets.
- Use only approved chargers and cables.
- Listening at high volumes for extended periods can cause hearing damage.
Package Contents
- PSB M4U TWM True Wireless Micro Planar Earphones
- Charging Case
- USB-C Charging Cable
- Silicone Ear Tips (3 sizes)
- Quick Start Guide
Setup
1. Initial Charging
Before first use, ensure the earphones and charging case are fully charged. Important: Completely remove the initial protective film covering the charging contacts of the earphones and case. Failure to do so will prevent proper charging.
- Place the earphones into the charging case.
- Connect the USB-C cable to the charging case and a power source, or place the case on a wireless charging pad.
- The indicator lights on the case will show charging status.
2. Ear Tip Selection
A proper fit is crucial for sound quality and comfort. Experiment with the three included sizes of silicone ear tips to find the best seal for your ears.
3. Bluetooth Pairing
- Open the charging case. The earphones will automatically enter pairing mode.
- On your device (smartphone, tablet, etc.), go to Bluetooth settings and enable Bluetooth.
- Select "PSB M4U TWM" from the list of available devices.
- Once connected, you will hear an audio prompt.
4. PSB Headphone App
Download the PSB Headphone app from your device's app store for enhanced control and personalization. The app allows you to:
- Create a custom sound profile using Audiodo sound calibration.
- Control noise transparency levels.
- Choose from preset EQ settings.
- Check battery levels.
Operating Your Earphones
Controls
The M4U TWM earphones feature hard click buttons on both earbuds for intuitive control:
- Volume Control: Adjust playback volume.
- Track Skipping: Navigate between songs.
- Voice Calls: Manage incoming and outgoing calls.
Sound Customization
Utilize the PSB Headphone app to personalize your listening experience:
- Audiodo Calibration: Analyzes your left and right ear separately to create a unique hearing profile.
- Signature RoomFeel Technology: Delivers a rich and natural sound experience.
- Preset EQ Settings: Select from various equalization options.
Water Resistance
The earbuds are IP65 rated, making them sweat and weather resistant. This makes them suitable for active lifestyles and outdoor use.

A person wearing the PSB M4U TWM earphones during a workout, demonstrating their secure fit for active lifestyles.

An individual exercising while wearing the PSB M4U TWM earphones, highlighting their suitability for physical activity.
Maintenance
Cleaning
Regularly clean your earphones and charging case to maintain performance and hygiene:
- Wipe the earphones and case with a soft, dry, lint-free cloth.
- Gently remove any earwax or debris from the ear tips and speaker grilles using a small, soft brush or cotton swab.
- Avoid using harsh chemicals or abrasive materials.
Charging Case
The smart charging case offers both wired USB-C and wireless charging options, providing up to 24 hours of additional charge.

The compact PSB M4U TWM charging case being conveniently stored in a bag, emphasizing portability.
Troubleshooting
- No Sound/Poor Sound Quality: Ensure earphones are properly seated in your ears with the correct ear tip size. Check Bluetooth connection and app settings for sound profiles.
- Charging Issues: Verify that the protective film has been removed from all charging contacts. Ensure the charging cable is securely connected or the case is correctly placed on a wireless charger.
- Connectivity Problems: Disconnect and re-pair the earphones with your device. Ensure your device's Bluetooth is enabled and the earphones are within range.
Specifications
| Feature | Detail |
|---|---|
| Model Name | M4U TWM |
| Connectivity Technology | Wireless (Bluetooth 5.0) |
| Audio Driver Type | Planar Magnetic Driver |
| Ear Placement | In Ear |
| Battery Life (Earbuds) | Up to 8 hours |
| Battery Life (with Case) | Up to 24 hours additional |
| Water Resistance Level | IP65 (Sweat and Weather Resistant) |
| Control Type | Volume Control, Touch |
| Charging | USB-C, Wireless |
| Item Weight | 5.6 ounces |
| Package Dimensions | 3.86 x 3.7 x 1.65 inches |
Official Product Video
Official product video showcasing the features and design of the PSB M4U TWM True Wireless Micro Planar Earphones.
Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the documentation included with your product or visit the official PSB Speakers website. You can also contact PSB Speakers US directly for assistance.





