SENTRY BT879

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:

SENTRY Bluetooth® Wireless Stereo Earbuds (Model BT879)
Deluxe travel friendly carry pouch
USB Charging Cable
User Manual

SENTRY Bluetooth Wireless Stereo Earbuds in retail packaging with included carry pouch

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).

SENTRY Bluetooth Wireless Stereo Earbuds with in-line controls

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

SENTRY Bluetooth Wireless Stereo Earbuds with detailed view of in-line controls

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.

You can find more information and support at the SENTRY Store on Amazon.

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