1. Introduction
Thank you for purchasing the Coioc S18 Portable Bluetooth Speaker. This manual provides essential information for setting up, operating, and maintaining your speaker. Please read it thoroughly before use to ensure optimal performance and longevity of your device.
2. Package Contents
Ensure all items are present in the package:
- Coioc S18 Portable Bluetooth Speaker
- Type-C Charging Cable
- Quick Start Guide

Image: Coioc S18 speaker with included accessories.
3. Product Features
- High-Fidelity 360° Stereo Sound: Delivers immersive and impactful audio with balanced and clear surround sound.
- 25W High Power Output: Two 55mm drivers provide rich, balanced sound with deep bass and clear treble.
- TWS Connectivity: Pair two S18 speakers for true wireless stereo HiFi sound.
- LED Battery Indicator: Digital display shows battery level from 1% to 100%.
- Extended Battery Life: 4000mAh battery offers over 25 hours of playback on a single charge.
- Bluetooth 5.4: Provides stable wireless connection up to 100 feet with reduced stuttering and delays.
- RGB Color Light Show: Dynamic lights sync with music beats, enhancing the listening experience.
- IPX7 Waterproof Rating: Protects against water immersion, suitable for outdoor use.
- Built-in Microphone: Supports voice calls and hands-free communication.
- Multiple Connection Methods: Supports Bluetooth, AUX, TF Card, and USB playback.
4. Setup
4.1 Powering On/Off
- To power on, press and hold the power button (U) for 2 seconds.
- To power off, press and hold the power button (U) for 2 seconds.
4.2 Bluetooth Pairing
- Ensure the speaker is powered on and in Bluetooth pairing mode (indicated by a flashing Bluetooth icon).
- On your device (smartphone, tablet, etc.), enable Bluetooth and search for available devices.
- Select "Coioc S18" from the list of devices.
- Once connected, the Bluetooth icon on the speaker will stop flashing and remain solid.
4.3 Other Connection Methods
The speaker supports AUX, TF Card, and USB connections.
- AUX: Connect an audio cable (not included) from your device's audio output to the speaker's AUX port.
- TF Card: Insert a TF (MicroSD) card with audio files into the TF card slot. The speaker will automatically switch to TF card mode.
- USB: Insert a USB drive with audio files into the USB port. The speaker will automatically switch to USB mode.

Image: Coioc S18 speaker with its four connection methods.
5. Operating Instructions
5.1 Button Functions
The speaker features intuitive button controls for various functions:
- Power Button (U): Press and hold for 2 seconds to power on/off.
- Light Button (☀): Press once to switch light modes. Press three times to turn off lights.
- Volume Up (△): Press once to increase volume.
- Volume Down (▽): Press once to decrease volume.
- Play/Pause (▷): Press once to play or pause music.
- Next Track (▷▷): Press and hold for 2 seconds to skip to the next track.
- Previous Track (◁◁): Press and hold for 2 seconds to go to the previous track.
- EQ Button (EQ): Press once to cycle through EQ modes.
- TWS Button (TWS): Press twice to initiate TWS pairing.
- Call Button (📞): Press once to answer/end a call. Press and hold for 2 seconds to reject a call.

Image: Smart Button Control layout and functions.
6. TWS Pairing (True Wireless Stereo)
To achieve a true wireless stereo experience, you can pair two Coioc S18 speakers together:
- Ensure both S18 speakers are powered on and not connected to any other Bluetooth device.
- On one of the speakers, quickly press the TWS button twice. The speaker will enter TWS pairing mode.
- The two speakers will automatically connect to each other. Once connected, you will hear an audio prompt.
- Now, connect your device to one of the paired speakers via Bluetooth as described in section 4.2. Both speakers will play audio simultaneously.

Image: TWS Wireless Pairing setup.
Video: This video demonstrates the key features of the Coioc S18 Portable Bluetooth Speaker, including its 30W extra-loud volume, Enhanced Bass 3.0, Bluetooth 5.4 connectivity, IPX7 waterproof rating, and various input options like AUX, TF Card, and Type-C. It also highlights the 30-hour playtime.
7. RGB Light Modes
The speaker features dynamic RGB lights that can be customized:
- Press the Light button (☀) once to cycle through different light modes.
- Press the Light button (☀) three times to turn off the lights.

Image: Multi-color RGB Breathing Light feature.
8. EQ Modes
The speaker offers different Equalizer (EQ) modes to optimize sound for various music genres:
- Press the EQ button (EQ) once to switch between available EQ modes (e.g., Normal, Vocal).

Image: EQ Mode selection.
9. Charging and Battery
The Coioc S18 speaker is equipped with a 4000mAh battery for extended playback.
- Connect the provided Type-C charging cable to the speaker's charging port and to a compatible USB power adapter (not included).
- The LED battery indicator will show the charging progress.
- A full charge provides over 25 hours of playback time (actual time may vary based on volume and light usage).
- The LED display accurately shows the battery percentage from 1% to 100%.

Image: 25H Playtime and Type-C Fast Charging.
10. Maintenance
To ensure the longevity and optimal performance of your speaker, follow these maintenance guidelines:
- Cleaning: Use a soft, dry cloth to clean the speaker's exterior. Do not use abrasive cleaners or solvents.
- Water Resistance: The speaker has an IPX7 waterproof rating, meaning it can withstand immersion in water up to 1 meter for 30 minutes. Ensure the charging port cover is securely closed before exposing it to water. Do not intentionally submerge for extended periods or in harsh conditions.
- Storage: Store the speaker in a cool, dry place away from direct sunlight and extreme temperatures.
- Charging: Use only the provided Type-C cable for charging. Avoid overcharging.

Image: IPX7 Waterproof rating demonstration.
11. Troubleshooting
If you encounter issues with your speaker, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Speaker does not power on | Low battery; Power button not pressed correctly | Charge the speaker fully; Press and hold the power button for 2 seconds. |
| Cannot pair via Bluetooth | Speaker not in pairing mode; Device Bluetooth off; Speaker already connected to another device | Ensure speaker is in pairing mode (flashing Bluetooth icon); Turn on Bluetooth on your device; Disconnect from other devices. |
| No sound | Volume too low; Incorrect input mode; Device not playing audio | Increase speaker and device volume; Switch to correct input mode (Bluetooth, AUX, TF, USB); Ensure audio is playing on your device. |
| TWS pairing fails | Speakers too far apart; One speaker already connected to a device | Ensure speakers are within close proximity; Disconnect both speakers from any other Bluetooth devices before initiating TWS pairing. |
| Lights not working | Lights turned off | Press the Light button (☀) once to activate light modes. |
12. Specifications
| Feature | Detail |
|---|---|
| Brand | coioc |
| Model Number | S18 |
| Speaker Maximum Output Power | 30 Watts |
| Connectivity Technology | Bluetooth |
| Bluetooth Version | 5.4 |
| Audio Output Mode | Stereo |
| Speaker Type | Portable Speaker |
| Waterproof Rating | IPX7 |
| Battery Average Life | 30 Hours (approx.) |
| Control Method | App, Buttons |
| Item Dimensions (D x W x H) | 5"D x 5"W x 5"H |
| Compatible Devices | Laptop, Smartphone, Tablet, Television |
| Additional Features | Bass Boost, Built-in Microphone, Display, Dustproof, LED Light, Lightweight, Portable, Stereo Pairing, USB Port |
13. Warranty and Support
The Coioc S18 Portable Bluetooth Speaker comes with a limited warranty. For specific warranty details and support inquiries, please refer to the Quick Start Guide included in your package or contact Coioc customer service.





