1. Introduction
This manual provides essential information for the safe and effective use of your Coby True Wireless Speaker (Model: CSTW416WH). Please read this manual thoroughly before operating the device and retain it for future reference. This portable speaker features a unique earbud-shaped design, Bluetooth connectivity, FM radio, a built-in microphone, and multiple playback options including Micro USB and TF card support.
2. Package Contents
Ensure all items are present upon unboxing:
- Coby True Wireless Speaker (CSTW416WH)
- Charging Cable (Micro USB)
- User Manual
3. Product Overview
The Coby True Wireless Speaker is designed for portability and versatile audio playback. It features intuitive controls and various input options.

Figure 3.1: Coby True Wireless Speaker in hand, highlighting its unique design.

Figure 3.2: Detailed view of the speaker's control panel and connectivity ports.
Controls and Ports:
- Power Button: Press and hold to turn on/off.
- Mode Button: Switches between Bluetooth, FM Radio, AUX, and TF Card modes.
- Volume Up / Next Track: Short press for next track, long press for volume up.
- Volume Down / Previous Track: Short press for previous track, long press for volume down.
- Play/Pause / Call Answer/End: Controls media playback and phone calls.
- Micro USB Port: For charging the speaker.
- TF Card Slot: For playing audio from a TF (MicroSD) card.
- 3.5mm AUX Port: For wired audio connection.
- Built-in Microphone: For hands-free calling.
4. Setup
4.1 Charging the Speaker
Before first use, fully charge the speaker. A full charge takes approximately 5 hours and provides up to 6 hours of playtime.
- Connect the Micro USB charging cable to the speaker's Micro USB port.
- Connect the other end of the cable to a USB power adapter (not included) or a computer's USB port.
- The charging indicator light will illuminate during charging and turn off once fully charged.
4.2 Initial Bluetooth Pairing
Follow these steps to pair your speaker with a Bluetooth-enabled device:
- Ensure the speaker is fully charged.
- Press and hold the Power button to turn on the speaker. A voice prompt will indicate it's in Bluetooth pairing mode.
- On your device (smartphone, tablet, etc.), enable Bluetooth and search for available devices.
- Select "Coby CSTW416WH" from the list of devices.
- Once paired, a voice prompt will confirm the connection.
5. Operating Instructions
5.1 Bluetooth Playback
After successful pairing, audio from your connected device will play through the speaker. Use the speaker's control buttons or your device to manage playback (play/pause, next/previous track, volume).
5.2 True Wireless Stereo (TWS) Pairing
To achieve surround sound, you can pair two Coby True Wireless Speakers together.

Figure 5.1: Two speakers paired using True Wireless Technology for stereo sound.
- Ensure both speakers are turned off.
- Turn on both speakers simultaneously. They will enter Bluetooth pairing mode.
- Double-press the Mode button on one of the speakers. It will search for the other speaker to pair for TWS.
- Once successfully paired in TWS mode, a voice prompt will confirm the connection.
- Now, connect your device to one of the speakers via Bluetooth as described in Section 4.2. Both speakers will play audio in stereo.
Note: Only one speaker is included with your purchase. A second speaker must be acquired separately for TWS functionality.
5.3 FM Radio Operation
- Turn on the speaker.
- Press the Mode button repeatedly until you hear the FM Radio prompt.
- Press the Play/Pause button once to automatically scan and save available FM stations.
- Use the Volume Up/Next Track and Volume Down/Previous Track buttons to navigate between saved stations.
5.4 AUX Input
For devices without Bluetooth, use the 3.5mm AUX port:
- Connect one end of a 3.5mm audio cable (not included) to the speaker's AUX port.
- Connect the other end to the audio output of your device.
- Press the Mode button until the speaker enters AUX mode.
- Control playback and volume from your connected device.
5.5 TF Card Playback
To play music directly from a TF (MicroSD) card:
- Insert a TF card (up to 32GB, not included) with MP3 audio files into the TF card slot.
- Turn on the speaker. It should automatically switch to TF card mode or you can select it using the Mode button.
- Use the speaker's control buttons to manage playback.
5.6 Hands-Free Calling
When connected via Bluetooth, the speaker's built-in microphone allows for hands-free calls:
- Answer Call: Press the Play/Pause button once.
- End Call: Press the Play/Pause button once during a call.
- Reject Call: Press and hold the Play/Pause button.
6. Maintenance
To ensure the longevity and optimal performance of your speaker:
- Clean the speaker with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Keep the speaker away from water, moisture, and extreme temperatures. This product is not waterproof.
- Avoid dropping or subjecting the speaker to strong impacts.
- When not in use for extended periods, store the speaker in a cool, dry place and charge it periodically to maintain battery health.
7. Troubleshooting
If you encounter issues with your speaker, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Speaker does not turn on. | Low battery. | Charge the speaker fully. |
| Cannot pair via Bluetooth. | Speaker not in pairing mode; device Bluetooth off; too far from device. | Ensure speaker is in pairing mode. Turn device Bluetooth on/off. Move speaker closer to device (within 49 feet). |
| No sound during playback. | Volume too low; incorrect mode selected; device not playing audio. | Increase speaker and device volume. Ensure correct mode (Bluetooth, AUX, TF) is selected. Verify audio is playing on the source device. |
| FM radio reception is poor. | Weak signal. | Move the speaker to a location with better signal reception. |
| TWS pairing fails. | Incorrect pairing steps; speakers too far apart. | Ensure both speakers are turned on and follow TWS pairing steps precisely. Keep speakers close during pairing. |
8. Specifications
Detailed technical specifications for the Coby True Wireless Speaker:

Figure 8.1: Speaker dimensions, showing a height of 6.8 inches.
- Model Name: Portable Bluetooth Speaker
- Model Number: CSTW416WH
- Speaker Type: Surround Sound (with TWS)
- Special Feature: Built-in Microphone
- Recommended Uses: For Smartphones or Tablets
- Compatible Devices: Smartphone
- Surround Sound Channel Configuration: 2.0 (with TWS)
- Color: 416 (White)
- Product Dimensions: 4.5"D x 5.25"W x 8.5"H (approximately 11.4cm D x 13.3cm W x 21.6cm H)
- Item Weight: 0.36 Kilograms (12.6 ounces)
- Is Waterproof: FALSE
- Maximum Range: 49 Feet (Bluetooth)
- Control Method: Touch
- Wireless Communication Technology: Bluetooth
- Speaker Size: 6.8 Inches
- Power Source: Battery Powered
- Woofer Diameter: 5 Centimeters
- Number of Batteries: 1 Lithium Ion battery (included)
- Audio Driver Type: Dynamic Driver
- Charging Time: 5 Hours
- Speaker Maximum Output Power: 3 Watts
- Audio Output Mode: Surround
- Mounting Type: Freestanding
9. Warranty Information
The Coby True Wireless Speaker comes with a Limited Warranty. For specific terms and conditions, please refer to the warranty card included in your product packaging or contact Coby customer support.
10. Support
For further assistance, technical support, or warranty claims, please visit the official Coby website or contact their customer service department. Contact information can typically be found on the product packaging or the brand's official website.
Online Resources: Visit the Coby Store on Amazon