Introduction
Thank you for choosing the SENTRY BLWBT301 Bluetooth Headphones. These wireless headphones are designed to provide a high-quality audio experience with the convenience of Bluetooth connectivity. They are compatible with a wide range of devices including phones, tablets, MP3 players, computers, and gaming consoles. Please read this manual carefully to ensure proper use and to maximize the lifespan of your headphones.
Safety Information
- Do not expose the headphones to extreme temperatures, humidity, or liquids.
- Avoid dropping or subjecting the headphones to strong impacts.
- Do not attempt to disassemble or modify the headphones. This will void the warranty.
- Clean the headphones with a soft, dry cloth only. Do not use harsh chemicals or abrasive materials.
- Prolonged listening at high volume levels may cause hearing damage. Adjust volume to a moderate level.
- Keep out of reach of children.
Package Contents
- SENTRY BLWBT301 Bluetooth Stereo Headphones
- USB Charging Cable
- User Manual

Image: The SENTRY BLWBT301 Bluetooth Headphones shown in their retail packaging, highlighting the "Black Diamond Wireless Headphone" branding and key features like Bluetooth connectivity and 10-hour battery life.
Product Overview
Familiarize yourself with the various parts and controls of your SENTRY BLWBT301 headphones.

Image: A front-angled view of the SENTRY BLWBT301 Bluetooth Headphones, showcasing their black and gold design, padded earcups, and adjustable headband. The control buttons are visible on the right earcup.

Image: A top-down view of the SENTRY BLWBT301 Bluetooth Headphones, clearly displaying the control buttons located on the side of the right earcup. These buttons include power, volume/track control, and call management.
Controls and Indicators:
- Power Button: Used to turn the headphones on/off and for Bluetooth pairing.
- Volume Up / Next Track Button: Short press for volume up, long press for next track.
- Volume Down / Previous Track Button: Short press for volume down, long press for previous track.
- Play/Pause / Call Button: Controls music playback and manages phone calls.
- LED Indicator: Shows power status, charging status, and Bluetooth pairing mode.
- Microphone: For hands-free calling.
- USB Charging Port: For connecting the charging cable.
Setup
1. Charging the Headphones:
- Connect the small end of the USB charging cable to the USB charging port on the headphones.
- Connect the larger end of the USB charging cable to a USB power source (e.g., computer USB port, USB wall adapter).
- The LED indicator will illuminate during charging. It will change color or turn off once fully charged (approximately 10 hours for a full charge).
- Ensure the headphones are fully charged before first use.
2. Bluetooth Pairing:
- Ensure the headphones are turned off.
- Press and hold the Power Button for approximately 5-7 seconds until the LED indicator flashes rapidly (often blue and red alternately), indicating pairing mode.
- On your Bluetooth-enabled device (smartphone, tablet, computer), go to the Bluetooth settings and ensure Bluetooth is enabled.
- Scan for available devices. You should see "BLWBT301" or "SENTRY BLWBT301" appear in the list.
- Select "BLWBT301" to connect. If prompted for a password, enter "0000".
- Once successfully paired, the LED indicator will typically stop flashing and remain solid blue, or flash slowly. A voice prompt may also confirm the connection.
- The headphones will automatically attempt to reconnect to the last paired device when powered on.
Operating Instructions
Power On/Off:
- To Power On: Press and hold the Power Button for about 3 seconds until the LED indicator lights up and you hear a power-on tone.
- To Power Off: Press and hold the Power Button for about 3 seconds until the LED indicator turns off and you hear a power-off tone.
Music Playback:
- Play/Pause: Press the Play/Pause Button once to play or pause music.
- Next Track: Long press the Volume Up / Next Track Button.
- Previous Track: Long press the Volume Down / Previous Track Button.
- Volume Up: Short press the Volume Up / Next Track Button.
- Volume Down: Short press the Volume Down / Previous Track Button.
Call Management:
- Answer/End Call: Press the Play/Pause / Call Button once to answer an incoming call or end an ongoing call.
- Reject Call: Press and hold the Play/Pause / Call Button for about 2 seconds to reject an incoming call.
- Redial Last Number: Double-press the Play/Pause / Call Button.
Maintenance
- Cleaning: Wipe the headphones with a soft, dry, lint-free cloth. Do not use liquid cleaners or sprays.
- Storage: When not in use, store the headphones in a cool, dry place, away from direct sunlight and extreme temperatures.
- Battery Care: To preserve battery life, charge the headphones regularly, even if not used frequently. Avoid fully discharging the battery for extended periods.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Headphones do not power on. | Low battery. | Charge the headphones fully. |
| Cannot pair with device. | Headphones not in pairing mode; Device Bluetooth off; Too far from device. | Ensure headphones are in pairing mode (flashing LED). Turn device Bluetooth off/on. Move headphones closer to device (within 100ft). |
| No sound or low volume. | Volume too low on headphones or device; Not properly paired. | Increase volume on both headphones and connected device. Re-pair the headphones. |
| Intermittent connection. | Too far from device; Obstructions; Interference. | Move closer to the device. Avoid physical obstructions. Minimize interference from other wireless devices. |
Specifications
| Model Name | Sentry BLWBT301 Bluetooth Black Diamond Black/Gold |
| Model Number | BLWBT301 |
| Connectivity Technology | Wireless (Bluetooth) |
| Bluetooth Version | 5.0 |
| Bluetooth Range | Up to 100 feet (30 meters) |
| Driver Unit | 40mm |
| Impedance | 32+/-3 Ohms |
| Sensitivity | 103dB+/-3dB |
| Frequency Response | 20Hz - 20kHz |
| Charging Time | Approximately 10 hours |
| Item Weight | 7.2 ounces (approx. 204 grams) |
| Product Dimensions | 9.84 x 1.97 x 3.94 inches |
| Material | Plastic, Rubber, Foam |
Warranty and Support
SENTRY Industries Inc. products are manufactured to the highest quality standards. For warranty information or technical support, please refer to the warranty card included with your product or visit the official SENTRY website. Please retain your proof of purchase for any warranty claims.
For further assistance, you may contact SENTRY customer service through their official channels.





