Introduction
This manual provides instructions for the Sentry BT900 On-Neck Bluetooth Headphones. It covers setup, operation, maintenance, and troubleshooting to ensure proper use of your wireless audio device.
Package Contents
Verify that the following items are included in your product package:
- Sentry BT900 On-Neck Bluetooth Headphones
- USB Charging Cable
- Assorted Ear Tips
- User Manual
Product Overview
Familiarize yourself with the components of your Sentry BT900 headphones.

The image displays the Sentry BT900 headphones, featuring a flexible neckband designed for comfortable wear. The earbuds are connected to the neckband, and control buttons are typically located on one side of the neckband for easy access.
Key Components:
- Power/Multi-function Button: Used for powering on/off, play/pause, answering/ending calls.
- Volume Up/Next Track Button: Increases volume, skips to the next track.
- Volume Down/Previous Track Button: Decreases volume, skips to the previous track.
- Micro-USB Charging Port: For connecting the charging cable.
- LED Indicator: Displays power, charging, and pairing status.
- Microphone: For hands-free calling.
Charging the Headphones
Before initial use, fully charge the headphones.
- Connect the small end of the USB charging cable to the Micro-USB 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 and change color or turn off when charging is complete.
- A full charge typically takes approximately 2-3 hours.
Pairing with a Bluetooth Device
Follow these steps to connect your headphones to a Bluetooth-enabled device:
- Ensure the headphones are turned off and fully charged.
- Press and hold the Power/Multi-function button for approximately 5-7 seconds until the LED indicator flashes red and blue alternately, indicating pairing mode.
- On your Bluetooth-enabled device (smartphone, tablet, etc.), navigate to the Bluetooth settings.
- Enable Bluetooth and search for available devices.
- Select 'Sentry BT900' from the list of found devices.
- Once paired, the LED indicator on the headphones will typically flash blue slowly or turn solid blue.
- If a passcode is requested, enter '0000'.
Operating the Headphones
Power On/Off:
- Power On: Press and hold the Power/Multi-function button for 3 seconds. The LED indicator will flash blue.
- Power Off: Press and hold the Power/Multi-function button for 3 seconds. The LED indicator will flash red and then turn off.
Music Playback:
- Play/Pause: Press the Power/Multi-function button once.
- Next Track: Press and hold the Volume Up button.
- Previous Track: Press and hold the Volume Down button.
Call Management:
- Answer/End Call: Press the Power/Multi-function button once.
- Reject Call: Press and hold the Power/Multi-function button for 2 seconds.
- Redial Last Number: Double-press the Power/Multi-function button.
Volume Control:
- Increase Volume: Press the Volume Up button repeatedly.
- Decrease Volume: Press the Volume Down button repeatedly.
Maintenance
Cleaning:
Gently wipe the headphones and earbuds with a soft, dry cloth. For ear tips, remove them and clean with a mild soap solution if necessary, then rinse and dry completely before reattaching.
Storage:
Store the headphones in a cool, dry place away from direct sunlight and extreme temperatures. Avoid placing heavy objects on them.
Battery Care:
To prolong battery life, avoid fully discharging the battery frequently. Charge the headphones regularly, even if not in use for extended periods.
Troubleshooting
Headphones do not power on:
Ensure the headphones are fully charged. Connect to a power source and attempt to power on after a few minutes.
Cannot pair with device:
Ensure the headphones are in pairing mode (flashing red and blue LED). Make sure Bluetooth is enabled on your device and it is within range (typically 10 meters). Turn off and on both the headphones and the device, then try pairing again.
No sound or low volume:
Check the volume levels on both the headphones and your connected device. Ensure the headphones are properly paired and connected. Try re-pairing the headphones.
Poor sound quality:
Ensure there are no obstructions between the headphones and your device. Move closer to your device. Check for interference from other wireless devices.
Charging issues:
Verify the USB cable is securely connected to both the headphones and the power source. Try a different USB cable or power source.
Specifications
- Model: BT900
- Wireless Communication Technology: Bluetooth
- Battery Type: 1 Lithium Ion (included)
- Item Weight: 2.39 ounces
- Product Dimensions: 8.25 x 1.5 x 6.75 inches
- Special Features: Microphone Included, Wireless
- UPC: 080068549000
Warranty and Support
For warranty information, please refer to the documentation included with your purchase or contact Sentry customer support.
Keep your proof of purchase for warranty claims.





