1. Introduction
Thank you for purchasing the Sentry SPBT3 Bluetooth Wireless Speaker. This manual provides essential information for setting up, operating, and maintaining your device. Please read it thoroughly before use and retain it for future reference.
Package Contents:
- Sentry SPBT3 Bluetooth Wireless Speaker
- USB Charging Cable
- User Manual (this document)

Figure 1: Sentry SPBT3 Bluetooth Speaker in its retail packaging, showing the speaker and branding.
2. Safety Information
To ensure safe operation and prevent damage, please observe the following precautions:
- Do not expose the speaker to water, moisture, or extreme temperatures. This product is not waterproof.
- Avoid dropping or subjecting the speaker to strong impacts.
- Do not attempt to disassemble, repair, or modify the speaker. This will void the warranty.
- Keep the speaker away from heat sources, direct sunlight, and flammable materials.
- Use only the provided USB charging cable or a certified equivalent.
- Dispose of the battery and speaker responsibly according to local regulations.
3. Product Overview
Familiarize yourself with the speaker's components and controls:

Figure 2: Front view of the Sentry SPBT3 Bluetooth Speaker, highlighting the central control panel.
Control Panel:
- Power Button (⏻): Press and hold to power on/off. Short press to Play/Pause music or Answer/End calls.
- Volume Up / Next Track (+ / ⏭): Short press for Volume Up. Long press for Next Track.
- Volume Down / Previous Track (− / ⏮): Short press for Volume Down. Long press for Previous Track.
- LED Indicator: Shows power status, charging status, and Bluetooth pairing status.
- Microphone: For hands-free calling.
Ports (typically on the side/back):
- Micro USB Charging Port: Connect the USB cable for charging.
- 3.5mm AUX Input: Connect external audio devices using a 3.5mm audio cable (not included).
4. Setup
4.1 Charging the Speaker
- Connect the small end of the included USB charging cable to the Micro USB port on the speaker.
- Connect the large end of the USB cable to a USB power adapter (e.g., smartphone charger, computer USB port) or a wall outlet.
- The LED indicator will illuminate (e.g., red) during charging and turn off or change color (e.g., blue) when fully charged.
- A full charge typically takes 2-3 hours.
4.2 Bluetooth Pairing
- Ensure the speaker is fully charged.
- Press and hold the Power Button (⏻) for approximately 3 seconds to turn on the speaker. The LED indicator will flash rapidly (e.g., blue), indicating it is in pairing mode.
- On your Bluetooth-enabled device (smartphone, tablet, etc.), go to the Bluetooth settings and enable Bluetooth.
- Search for available devices. You should see "SPBT3" or "Sentry SPBT3" in the list.
- Select "SPBT3" to connect. Once paired, the LED indicator will stop flashing and remain solid (e.g., blue), and you may hear an audible confirmation tone.
- If prompted for a password, enter "0000".
- The speaker will automatically attempt to reconnect to the last paired device when powered on.
4.3 AUX Connection
- Connect one end of a 3.5mm audio cable (not included) to the AUX input port on the speaker.
- Connect the other end of the 3.5mm audio cable to the headphone jack or audio output of your external device.
- The speaker will automatically switch to AUX mode. Control playback and volume from your connected device.
5. Operating Instructions
5.1 Power On/Off
- Power On: Press and hold the Power Button (⏻) for approximately 3 seconds.
- Power Off: Press and hold the Power Button (⏻) for approximately 3 seconds.
5.2 Music Playback (Bluetooth Mode)
- Play/Pause: Short press the Power Button (⏻).
- Volume Up: Short press the Volume Up (+) button.
- Volume Down: Short press the Volume Down (−) button.
- Next Track: Long press the Next Track (⏭) button.
- Previous Track: Long press the Previous Track (⏮) button.
5.3 Hands-Free Calling
- Answer Call: Short press the Power Button (⏻) when an incoming call rings.
- End Call: Short press the Power Button (⏻) during a call.
- Reject Call: Long press the Power Button (⏻) when an incoming call rings.
- Redial Last Number: Double-press the Power Button (⏻).
6. Maintenance
6.1 Cleaning
- Wipe the speaker's exterior with a soft, dry, lint-free cloth.
- Do not use abrasive cleaners, solvents, or chemical sprays.
- Avoid getting moisture into any openings.
6.2 Storage
- Store the speaker in a cool, dry place away from direct sunlight and extreme temperatures.
- If storing for an extended period, charge the battery periodically (e.g., every 3 months) to maintain battery health.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Speaker won't turn on. | Low battery. | Charge the speaker fully. |
| Cannot pair via Bluetooth. | Speaker not in pairing mode; Bluetooth disabled on device; device too far. | Ensure speaker is in pairing mode (flashing LED). Enable Bluetooth on your device. Move device closer to speaker (within 10 meters). Forget "SPBT3" on your device and try pairing again. |
| No sound. | Volume too low; incorrect input mode; device not connected. | Increase volume on both speaker and connected device. Ensure correct mode (Bluetooth or AUX). Verify successful Bluetooth connection or AUX cable connection. |
| Poor sound quality. | Low battery; interference; device too far. | Charge the speaker. Move speaker closer to the connected device. Avoid obstacles between speaker and device. |
8. Specifications
| Feature | Detail |
|---|---|
| Model Name | SPBT3 |
| Speaker Type | Soundbar |
| Connectivity Technology | Bluetooth |
| Wireless Communication | Bluetooth |
| Special Features | Bluetooth, Portable, Wireless, Built-in Microphone, 3.5mm AUX jack |
| Audio Output Mode | Stereo |
| Surround Sound Channel Configuration | 2.0 |
| Speaker Maximum Output Power | 3 Watts |
| Speaker Size | 52 Millimeters |
| Power Source | Battery Powered |
| Battery Type | 1 Lithium Ion battery (included) |
| Colour | Black |
| Item Weight | 454 g (1 Pounds) |
| Product Dimensions (L x W x H) | 27.94 x 10.16 x 7.62 cm |
| Is Waterproof | False |
| Manufacturer | Sentry Industries Inc. |
9. Warranty and Support
Sentry Industries Inc. provides a limited warranty for this product. For specific warranty terms and conditions, please refer to the documentation included with your purchase or visit the manufacturer's official website.
For technical support, troubleshooting assistance, or warranty claims, please contact Sentry Industries Inc. customer service. Contact information can typically be found on the product packaging or the manufacturer's website.
Please have your model number (SPBT3) and proof of purchase ready when contacting support.





