Product Overview
The comiso C15 Shower Bluetooth Speaker is a portable audio device designed for various environments, including wet conditions. It features IPX7 waterproofing, multi-color LED lights, True Wireless Stereo (TWS) pairing, and a built-in microphone for hands-free calls. Its compact design and durable construction make it suitable for both indoor and outdoor use.

Figure 1: The comiso C15 Shower Bluetooth Speaker, showcasing its design and active LED lights while floating in water.
Package Contents
Ensure all items are present upon unboxing:
- 1 x comiso C15 IPX7 Waterproof Shower Bluetooth Speaker with LED Light Mode
- 1 x USB Type-C Charging Cable
- 1 x Flexible Silicone Lanyard
- 1 x Instruction Manual (this document)
- 1 x Warranty and Customer Service Card
Setup
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 source (e.g., computer, wall adapter). The charging time is approximately 3 hours.
2. Powering On/Off
Press and hold the Power button (usually marked with a power icon or O/M) for a few seconds until the LED lights illuminate and an audible prompt indicates the speaker is on. Repeat to power off.
3. Bluetooth Pairing
- Ensure the speaker is powered on and in pairing mode (LED indicator will typically flash).
- On your device (smartphone, tablet, laptop), enable Bluetooth and search for available devices.
- Select "C15" from the list of devices.
- Once connected, the speaker will provide an audible confirmation, and the LED indicator will show a steady light.
4. True Wireless Stereo (TWS) Pairing (Optional)
To achieve an immersive stereo experience with two C15 speakers:
- Ensure both C15 speakers are powered on and not connected to any other Bluetooth device.
- On one speaker (this will be the primary speaker), press and hold the TWS pairing button (refer to speaker markings if available, otherwise try a long press on the play/pause button or a dedicated button).
- The speakers will search for each other and automatically pair. An audible prompt will confirm successful TWS connection.
- Connect your device to the primary speaker via Bluetooth as described in step 3. Audio will now play through both speakers in stereo.

Figure 2: Two comiso C15 speakers paired together for True Wireless Stereo sound, connected to a laptop.
Operating Instructions
Basic Controls
- Play/Pause: Short press the Power/Play/Pause button.
- Volume Up: Short press the '+' button.
- Volume Down: Short press the '-' button.
- Next Track: Long press the '+' button.
- Previous Track: Long press the '-' button.
- Answer/End Call: Short press the Power/Play/Pause button during an incoming call.
- Reject Call: Long press the Power/Play/Pause button during an incoming call.
- Activate Voice Assistant: Double-press the Power/Play/Pause button.
LED Light Modes
The speaker features multiple multi-color LED light modes:
- Short press the "Light Button" (usually located near the charging port or marked with a light icon) to cycle through different light modes.
- Press again to switch to the next mode.
- To turn off the lights, cycle through all modes until the lights are off.
Video 1: Demonstration of the IPX7 waterproof speaker with its multiple colored light modes. This video illustrates how the lights change and interact with the speaker's design.
Maintenance
Cleaning
To clean the speaker, use a soft, damp cloth. Avoid using harsh chemicals or abrasive cleaners, as these can damage the speaker's finish or waterproof seals. For stubborn stains, gently rinse under running water and ensure the charging port cover is securely closed.
Video 2: This video highlights the IPX7 waterproof capabilities of the speaker, demonstrating its durability and ease of cleaning after exposure to water.
Storage
Store the speaker in a cool, dry place away from direct sunlight and extreme temperatures. If storing for an extended period, ensure the battery is partially charged (around 50%) to prolong its lifespan.
Waterproof Care
Always ensure the charging port cover is firmly sealed before exposing the speaker to water to maintain its IPX7 waterproof rating. After use in water, wipe the speaker dry and allow any residual water in the speaker grille to drain completely.

Figure 3: The comiso C15 speaker submerged underwater, confirming its IPX7 waterproof rating.
Troubleshooting
- Speaker won't turn on: Ensure the battery is charged. Connect to a power source and try again.
- Unable to pair via Bluetooth:
- Make sure the speaker is in pairing mode (flashing LED).
- Ensure Bluetooth is enabled on your device.
- Move the speaker closer to your device.
- Forget "C15" from your device's Bluetooth list and try pairing again.
- Ensure no other devices are currently connected to the speaker.
- No sound or low volume:
- Increase the volume on both the speaker and your connected device.
- Ensure the speaker is properly connected via Bluetooth.
- If used in water, ensure the speaker grille is clear of water.
- TWS pairing issues:
- Ensure both speakers are fully charged and not connected to any other device.
- Place speakers close to each other during pairing.
- Power off both speakers and try the TWS pairing process again.
- LED lights not working:
- Press the "Light Button" to cycle through modes or turn them on.
- Ensure the speaker has sufficient battery charge.
Specifications
| Feature | Detail |
|---|---|
| Model Name | C15 |
| Material | Acrylonitrile Butadiene Styrene (ABS) |
| Speaker Type | Single Speaker |
| Wireless Communication Technology | Bluetooth 5.3 |
| Waterproof Rating | IPX7 (Submersible up to 1 meter for 30 minutes) |
| Speaker Maximum Output Power | 8 Watts |
| Battery Capacity | 2000 mAh Lithium Ion |
| Playtime | Up to 25 hours (at medium volume) |
| Charging Time | Approximately 3 hours |
| Product Dimensions | 4.2"D x 4.2"W x 2"H |
| Item Weight | 230 Grams (8.1 ounces) |
| Special Features | Built-in Microphone, Shockproof, Waterproof, Floating, Multi-color LED Lights, True Wireless Stereo (TWS) |
Warranty and Support
The comiso C15 Shower Bluetooth Speaker comes with a 365-day warranty from the date of purchase. This warranty covers manufacturing defects and issues arising from normal use.
For warranty claims, technical support, or any questions regarding your product, please refer to the included Warranty and Customer Service Card or visit the official comiso website. Our friendly customer service team is always available to assist you.





