SENTRY Bluetooth® Wireless Stereo Earbuds with Mic - Model BT879
Official User Manual
Introduction
Thank you for purchasing the SENTRY Bluetooth® Wireless Stereo Earbuds with Mic, Model BT879. These earbuds are designed to provide a high-quality audio experience with the convenience of wireless connectivity. This manual will guide you through the setup, operation, and maintenance of your new earbuds.
For optimal performance and longevity, please read this manual thoroughly before use and retain it for future reference.
Important Safety Information
WARNING:
This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Please handle with care and dispose of responsibly.
Do not expose the earbuds to extreme temperatures, moisture, or corrosive materials.
Do not disassemble or attempt to repair the earbuds yourself. This may void the warranty and cause damage.
Keep out of reach of children and pets.
Avoid listening at high volumes for extended periods to prevent hearing damage.
What's in the Box
Your SENTRY Bluetooth® Wireless Stereo Earbuds package should contain the following items:
Image: The SENTRY BT879 earbuds displayed in their retail packaging, showcasing the earbuds, in-line controls, and the included deluxe carry pouch.
Setup Guide
1. Charging the Earbuds
Before first use, ensure your earbuds are fully charged. The earbuds are equipped with a Lithium-ion battery.
Locate the charging port on the in-line control unit.
Connect the provided USB charging cable to the earbuds and plug the other end into a USB power source (e.g., computer USB port, wall adapter).
An indicator light will typically show the charging status. Refer to the light behavior for full charge indication (e.g., light turns off or changes color).
Image: Close-up of the SENTRY BT879 earbuds, highlighting the in-line control unit which houses the charging port and control buttons.
2. Pairing with a Bluetooth Device
The SENTRY BT879 earbuds are compatible with devices that have Bluetooth capabilities and microphone support.
Ensure the earbuds are charged and turned off.
Press and hold the power button on the in-line control unit until the indicator light begins to flash, indicating pairing mode. (Typically blue/red flashing).
On your device (smartphone, tablet, computer), go to the Bluetooth settings.
Search for available devices. The earbuds should appear as "SENTRY BT879" or similar.
Select the earbuds from the list to initiate pairing.
Once successfully paired, the indicator light on the earbuds will typically stop flashing and remain solid blue, or turn off. A voice prompt may also confirm the connection.
The Bluetooth range is approximately 10 meters (33 feet).
Operating Instructions
The in-line control unit allows for easy management of your audio and calls.
Control Buttons Overview
Image: A detailed view of the SENTRY BT879 in-line control unit, showing the various buttons for power, volume, and track control.
In-Line Control Functions
Button/Action
Function
Power Button (Center)
Press and Hold: Power On/Off, Enter Pairing Mode
Single Press (Music): Play/Pause
Single Press (Call): Answer/End Call
Double Press (Call): Redial Last Number
Press and Hold (Call): Reject Incoming Call
Volume Up (+)
Single Press: Increase Volume
Press and Hold: Next Track
Volume Down (-)
Single Press: Decrease Volume
Press and Hold: Previous Track
Music Playback
To play or pause music, press the Power Button once.
To skip to the next track, press and hold the Volume Up (+) button.
To go to the previous track, press and hold the Volume Down (-) button.
To adjust volume, press the Volume Up (+) or Volume Down (-) buttons briefly.
Making and Receiving Calls
To answer an incoming call, press the Power Button once.
To end an active call, press the Power Button once.
To reject an incoming call, press and hold the Power Button for approximately 2 seconds.
To redial the last number, double-press the Power Button.
The built-in in-line microphone allows for clear hands-free communication.
Care and Maintenance
Proper care will ensure the longevity and optimal performance of your SENTRY earbuds.
Cleaning: Use a soft, dry, lint-free cloth to clean the earbuds. Do not use abrasive cleaners, alcohol, or chemical solvents. Gently wipe the ear tips and the body of the earbuds.
Storage: When not in use, store the earbuds in the provided deluxe travel friendly carry pouch to protect them from dust, dirt, and physical damage.
Temperature: Avoid exposing the earbuds to extreme temperatures (hot or cold) as this can affect battery life and internal components.
Moisture: Keep the earbuds dry. Do not immerse them in water or expose them to excessive moisture.
Troubleshooting
If you encounter issues with your earbuds, please refer to the following common problems and solutions:
Problem
Possible Cause / Solution
Earbuds do not power on.
Battery is depleted. Charge the earbuds fully.
Power button not held long enough. Press and hold the power button until the indicator light appears.
Cannot pair with device.
Earbuds are not in pairing mode. Ensure the indicator light is flashing (e.g., blue/red).
Bluetooth is off on your device. Enable Bluetooth in your device's settings.
Earbuds are already connected to another device. Disconnect from the previous device or turn off Bluetooth on that device.
Distance too far. Ensure earbuds are within 10 meters of your device.
Interference. Move away from other wireless devices or strong electromagnetic fields.
Try forgetting the device on your phone and re-pairing.
No sound or low volume.
Volume on earbuds or device is too low. Increase volume using the '+' button on the earbuds and on your device.
Earbuds are not properly connected. Re-pair the earbuds with your device.
Audio output setting on your device is incorrect. Ensure audio is routed to the Bluetooth earbuds.
Sound quality is poor or intermittent.
Distance from device is too far or there are obstacles. Reduce distance and remove obstructions.
Low battery. Charge the earbuds.
Interference from other wireless devices. Move to an area with less interference.
Microphone not working.
Ensure the earbuds are properly connected and selected as the audio input device on your phone/computer.
Check for any mute functions on your device or in the application you are using.
Technical Specifications
Feature
Specification
Model
BT879
Connectivity
Bluetooth Wireless
Bluetooth Range
10 Meters
Driver Unit
15mm
Frequency Response
20Hz - 20kHz
Impedance
32 ohms
Sensitivity
100dB +/- 3dB
Battery Type
Lithium-ion
Control Type
In-line Control Buttons
Microphone
Yes (In-line)
Material
Metal, Plastic, Silicone
Color
White
Ear Placement
In Ear
Form Factor
In Ear
Headphones Jack
No Jack
Product Dimensions
3.5 x 6.75 x 3.8 inches
Item Weight
5.4 ounces
Manufacturer
Sentry
UPC
080068548799, 800685487994
Warranty and Support
SENTRY Industries is committed to customer satisfaction. While specific warranty details are not provided in this manual, most SENTRY products come with a limited warranty against defects in materials and workmanship.
For warranty claims, technical support, or further assistance, please visit the official SENTRY website or contact their customer service department. Keep your proof of purchase for any warranty-related inquiries.
