1. Introduction
Thank you for purchasing the SODLK T21 40W Portable Bluetooth Speaker. This manual provides essential information for setting up, operating, and maintaining your speaker. Please read it carefully before use to ensure optimal performance and longevity of the product.
2. Product Features
- 6D stereo surround sound for an immersive audio experience.
- Strengthened deep bass with 2pcs vibrating diaphragm.
- 4pcs built-in driver unit (2pcs bass driver unit + 2pcs Mids & Tweets) for balanced sound.
- 5Play model: Supports TF card slot, U disk, AUX input, Bluetooth, and TWS connection.
- 2pcs power amplifier for robust audio output.
- Integrated LED light for visual ambiance.
- Inbuilt 3600mAh battery for extended playtime.
- TWS (True Wireless Stereo) function to connect two speakers for amplified stereo sound.
3. Package Contents
Upon unpacking, please ensure all items listed below are present and in good condition:
- SODLK T21 Portable Bluetooth Speaker
- USB Type-C Charging Cable
- User Manual

Image: The SODLK T21 Portable Bluetooth Speaker, highlighting its ultra-portable design and key features like IPX7 waterproof rating, BT 5.3, punchy bass, voice assistant, Type-C port, 18 hours playtime, stereo pairing, and hands-free calls.
4. Controls and Indicators
Familiarize yourself with the speaker's control panel for easy operation:

Image: A detailed view of the SODLK T21 speaker's control panel, showing buttons for Power/EQ, Volume Up/Next Track, Play/Pause/Answer/Hang Up/Reject/Redial/Awaken Siri, Volume Down/Previous Track, Mode Switch/RGB Control, and TWS/BT Disconnection.
- Power Button / EQ: Press and hold to power on/off. Short press to cycle through EQ modes.
- VOL+ / NEXT track: Short press to increase volume. Long press to skip to the next track.
- Play-Pause / Answer-Hang up-Reject-Redial the call / Awaken Siri: Short press for play/pause. Short press to answer/hang up calls. Long press to reject calls. Double press to redial. Triple press to awaken Siri (or other voice assistant).
- VOL- / PREV track: Short press to decrease volume. Long press to go to the previous track.
- Mode Switch / RGB Control: Short press to switch between input modes (Bluetooth, TF card, U disk, AUX). Long press to control RGB lighting effects.
- TWS / BT Disconnection: Short press to initiate TWS pairing. Long press to disconnect Bluetooth.
5. Setup and Operation
5.1 Charging the Speaker
Before first use, fully charge the speaker. Connect the provided USB Type-C cable to the speaker's charging port and the other end to a compatible USB power adapter (5V/1A recommended). The charging time is approximately 3-4 hours.
5.2 Power On/Off
Press and hold the Power Button for 2-3 seconds to turn the speaker on or off. An audible prompt will indicate the power status.
5.3 Bluetooth Pairing
- Turn on the speaker. It will automatically enter Bluetooth pairing mode, indicated by a flashing LED light.
- Enable Bluetooth on your device (smartphone, tablet, etc.).
- Search for "SODLK T21" in the list of available Bluetooth devices and select it to connect.
- Once connected, the LED light will become solid, and you will hear a confirmation tone.
5.4 TWS (True Wireless Stereo) Pairing
To achieve stereo sound, you can connect two SODLK T21 speakers together:

Image: Two SODLK T21 speakers shown side-by-side with a TWS icon and dashed lines indicating a wireless connection, illustrating the stereo pairing feature.
- Ensure both SODLK T21 speakers are powered on and not connected to any other Bluetooth device.
- On one speaker (this will be the primary speaker), short press the TWS Button. The speaker will enter TWS pairing mode.
- The two speakers will automatically connect to each other. A confirmation tone will sound once TWS pairing is successful.
- Now, connect your device to the primary speaker via Bluetooth as described in section 5.3. Both speakers will play audio in stereo.
5.5 Mode Switching
Short press the Mode Switch Button (M) to cycle through available input modes: Bluetooth, TF Card, U Disk, and AUX. The speaker will announce the current mode.
5.6 RGB Light Control
Long press the Mode Switch Button (M) to change or turn off the RGB lighting effects.

Image: The SODLK T21 speaker displaying a vibrant rainbow light show, illustrating its 16.8 million color RGB light effect feature.
6. Maintenance
- Clean the speaker with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Keep the speaker away from extreme temperatures, direct sunlight, and moisture.
- Do not attempt to disassemble or repair the speaker yourself. This will void the warranty.
- Store the speaker in a cool, dry place when not in use for extended periods.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Speaker does not turn on. | Low battery. | Charge the speaker fully. |
| Cannot pair via Bluetooth. | Speaker is not in pairing mode or already connected to another device. | Ensure the speaker is in pairing mode (flashing LED). Disconnect from other devices. Restart both speaker and device. |
| No sound. | Volume too low, incorrect input mode, or device not playing. | Increase volume on both speaker and device. Check input mode. Ensure audio is playing on the connected device. |
| TWS pairing fails. | Speakers are too far apart or already connected to other devices. | Ensure speakers are within close proximity. Disconnect both speakers from any other Bluetooth devices before initiating TWS pairing. |
8. Specifications

Image: The SODLK T21 speaker with its dimensions (232mm height, 100mm width) and a table of specifications including model number, color, BT version, output, waterproof rating, play time, charging time, working distance, input, speaker size, and speaker weight.
| Feature | Detail |
|---|---|
| Model No. | T21 |
| Color | Black |
| BT Version | BT5.3 |
| Output | 40W |
| Waterproof | IPX7 |
| Play Time | Up to 18 hours |
| Charging Time | 3-4 hours |
| Working Distance | Up to 18M |
| Input | 5V/1A |
| Speaker Size | 232mm * 100mm |
| Speaker Weight | 1.12KG |
9. Warranty and Support
The SODLK T21 Portable Bluetooth Speaker comes with a standard manufacturer's warranty. Please refer to the warranty card included in your package for specific terms and conditions. For technical support or service inquiries, please contact your retailer or the SODLK customer service team.





