Introduction
This manual provides detailed instructions for the operation and maintenance of your SUPNIU S50 Portable Bluetooth Speaker. Please read this manual thoroughly before using the product to ensure proper function and to extend its lifespan. Keep this manual for future reference.

Image: Front and back view of the SUPNIU S50 Portable Bluetooth Speaker, showcasing its compact design and integrated handle.
Product Overview
Components and Controls
Familiarize yourself with the speaker's components and control panel for optimal use.

Image: Detailed diagram illustrating the control buttons and input ports on the top panel of the SUPNIU S50 speaker, including Power Switch, Previous Song, Next Song, Mode, TWS Series Connection, Play/Pause Button, LED Mode, TF Card slot, USB Port, AUX Port, and CHARGE Port.
- Power Switch: Turns the speaker on or off.
- Previous Song: Skips to the previous track.
- Next Song: Skips to the next track.
- Mode Button: Switches between input modes (Bluetooth, AUX, USB, TF Card).
- TWS Series Connection Button: Initiates True Wireless Stereo pairing.
- Play/Pause Button: Plays or pauses audio.
- LED Mode Button: Changes the LED light display mode.
- TF Card Slot: For playing music from a TF (MicroSD) card.
- USB Port: For playing music from a USB drive.
- AUX Port: For wired audio input via a 3.5mm audio jack.
- CHARGE Port (DC-5V): For charging the speaker.
Setup
Initial Charging
Before first use, fully charge the speaker. Connect the provided USB-C cable to the CHARGE Port (DC-5V) on the speaker and the other end to a compatible USB power adapter (not included). The charging indicator will illuminate. Charging typically takes 3-4 hours.
A full charge provides approximately 7-24 hours of playtime, depending on the volume level and audio content.

Image: Visual representation of the SUPNIU S50 speaker's battery performance, indicating charging time and playback duration.
Powering On/Off
Press and hold the Power Switch button to turn the speaker on or off.
Operating Instructions
Bluetooth Pairing
- Turn on the speaker. It will automatically enter Bluetooth pairing mode, indicated by a flashing LED light.
- On your device (smartphone, tablet, computer), enable Bluetooth and search for available devices.
- Select "SUPNIU S50" from the list of devices.
- Once connected, the speaker will emit a confirmation sound, and the LED light will stop flashing.

Image: The SUPNIU S50 speaker demonstrating compatibility with multiple devices and input methods, including Bluetooth, USB, TF Card, and AUX connection.
True Wireless Stereo (TWS) Pairing
To achieve a stereo sound experience, you can pair two SUPNIU S50 speakers together.
- Ensure both SUPNIU S50 speakers are powered on and not connected to any Bluetooth device.
- On one of the speakers (this will be the primary speaker), press the TWS Series Connection Button. The speaker will indicate it's searching for another TWS speaker.
- The two speakers will automatically connect to each other. A confirmation sound will indicate successful pairing.
- Once TWS is established, connect your device to the primary speaker via Bluetooth as described in the "Bluetooth Pairing" section.

Image: Two SUPNIU S50 speakers positioned to illustrate True Wireless Stereo (TWS) pairing, creating a wider soundstage.
LED Light Modes
The speaker features dynamic LED lights that can synchronize with music.
- Press the LED Mode Button to cycle through different light patterns.
- Press and hold the LED Mode Button to turn the LED lights off.

Image: The SUPNIU S50 speaker showcasing its colorful LED light display, with examples of different light patterns.
AUX, USB, and TF Card Playback
The speaker supports audio playback from various sources:
- AUX Input: Connect an audio device using a 3.5mm AUX cable to the AUX Port. The speaker will automatically switch to AUX mode or you can select it using the Mode Button.
- USB Playback: Insert a USB flash drive containing MP3 audio files into the USB Port. The speaker will automatically switch to USB mode and begin playback.
- TF Card Playback: Insert a TF (MicroSD) card containing MP3 audio files into the TF Card Slot. The speaker will automatically switch to TF Card mode and begin playback.
Maintenance
- Clean the speaker with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Avoid exposing the speaker to extreme temperatures, direct sunlight, or moisture.
- Store the speaker in a cool, dry place when not in use.
- Do not attempt to disassemble or repair the speaker yourself, as this will void the warranty.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Speaker does not turn on. | Battery is depleted. | Charge the speaker fully. |
| Cannot pair via Bluetooth. | Bluetooth is not enabled on your device; speaker is already connected to another device; speaker is too far from device. | Ensure Bluetooth is on. Disconnect from other devices. Move speaker closer to your device (within 10 meters). Restart both speaker and device. |
| No sound. | Volume is too low; incorrect input mode selected; device is paused. | Increase volume on both speaker and connected device. Press the Mode Button to select the correct input. Ensure playback is not paused. |
| TWS pairing fails or only one speaker plays sound. | Speakers are too far apart; one speaker is already connected to a Bluetooth device; incorrect pairing procedure. | Ensure both speakers are within close proximity (e.g., 1-2 meters). Disconnect both speakers from any Bluetooth devices before initiating TWS pairing. Follow the TWS pairing steps precisely. If issues persist, power cycle both speakers and try again. |
| LED lights are off. | Lights have been turned off. | Press the LED Mode Button to reactivate the lights. |
Specifications

Image: A visual representation of the SUPNIU S50 speaker's key product parameters, including dimensions, power, battery, and connectivity.
- Model Number: US-S50
- Output Power: 30W
- Driver: 1 x 4-inch Full-Range Driver
- Connectivity: Bluetooth 5.0, USB, AUX, TF Card
- TWS Support: Yes
- Battery: 3.7V / 4000mAh
- Charging Time: ≤ 4 hours
- Power Supply: DC 5V
- Playtime: 7-24 hours (varies by volume/content/usage)
- Product Dimensions (L x W x H): 8.11 x 3.23 x 9.45 inches (205 x 82 x 240 mm)
- Item Weight: 2.98 pounds (1.36 kg)
- Material: Acrylonitrile Butadiene Styrene (ABS)
- Frequency Response: 20 KHz
Warranty and Support
The SUPNIU S50 Portable Bluetooth Speaker comes with a standard manufacturer's warranty. For specific warranty details, please refer to the documentation included with your purchase or contact SUPNIU customer support.
If you encounter any issues not covered in this manual, please contact SUPNIU customer service for assistance. Please have your model number (S50) and purchase information ready.





