N-278 BT Stereo Bluetooth Headphones

Product Overview

Charging

The N-278 BT headphones are equipped with a built-in rechargeable lithium-ion battery. Before initial use, it is recommended to charge the unit for 2 to 3 hours.

To charge, connect the supplied USB charging cable to the USB charging port (6) on the headphones and the other end to a powered USB port, such as a computer or a USB wall adapter.

During charging, the LED indicator (4) will illuminate red. Once the battery is fully charged, the LED indicator will turn off.

Bluetooth Stereo Headphones Operation

Pairing a Bluetooth Device

1. Ensure the headphones are fully charged.
2. Press and hold the Multi-function button (3) for approximately 3 seconds to power on the unit. The LED indicator (4) will flash blue and red alternately, indicating that the headphones are in pairing mode.
3. On your Bluetooth-enabled device (e.g., smartphone, tablet), activate Bluetooth and search for available devices.
4. Select "N-278 BT" from the list of found devices to connect. If prompted for a password, enter "0000".
5. Once successfully connected, the LED indicator (4) will flash blue slowly.
6. The headphones will automatically connect to the last paired device when powered on, provided the device is within range and its Bluetooth function is enabled.

Using Bluetooth Functions

• Answering a Call: Press the Multi-function button (3) to answer an incoming call.
• Ending a Call: Press the Multi-function button (3) to end an active call.
• Rejecting a Call: Press and hold the Multi-function button (3) for 2 seconds to reject an incoming call.
• Redialing Last Number: Double-press the Multi-function button (3) to redial the last dialed number.
• Playing/Pausing Music: Press the Multi-function button (3) to play or pause audio playback.
• Next/Previous Track: Press the Volume + button (1) for the next track. Press the Volume - button (2) for the previous track.
• Volume Control: Press and hold the Volume + button (1) to increase the volume. Press and hold the Volume - button (2) to decrease the volume.

AUX IN Jack

The N-278 BT headphones feature a 3.5mm audio input for wired connection.

To use this feature, connect one end of a 3.5mm audio cable (not supplied) to the AUX IN jack (7) on the headphones and the other end to the LINE OUT or headphone jack of an external audio device (e.g., MP3 player, smartphone, tablet, computer).

The headphones will automatically switch to AUX mode when a cable is connected.

Troubleshooting Guide

If you encounter issues with your N-278 BT headphones, refer to the following troubleshooting tips:

No Sound / General Issues

• Ensure the headphones are powered ON and have sufficient battery charge.
• Verify that the headphones are correctly paired with your Bluetooth device.
• Adjust the volume levels on both the headphones and your Bluetooth device.
• If using AUX mode, ensure the audio cable is securely connected at both ends.

Poor Sound Quality

• Ensure the headphones are within the Bluetooth operating range (up to 10 meters).
• Move the headphones closer to your Bluetooth device.
• Remove any physical obstacles between the headphones and the Bluetooth device that might interfere with the signal.
• Avoid interference from other electronic devices operating nearby.

Specifications

• Power Supply: Built-in rechargeable lithium-ion battery, Type 3.7V 270mAh.
• Charging Time: Approximately 2-3 hours.
• Play Time: Approximately 8 hours (at 50% volume).
• Bluetooth:
  • Version: V4.0 + EDR
  • Range: Up to 10 meters (in open space)
  • Frequency: 2.402-2.480 GHz

Specifications are subject to change without prior notice.

Important Warnings and Safety Information

• Do not expose the unit to dripping or splashing liquids.
• Do not place objects filled with liquids, such as vases, on the unit.
• Use only attachments and accessories specified by the manufacturer.
• Do not block any ventilation openings.
• Do not place the unit near heat sources, such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
• Do not expose the unit to direct sunlight.
• Do not place heavy objects on the unit.
• Do not drop the unit.
• Do not attempt to disassemble the unit.
• Do not use the unit in extremely cold or hot environments.
• Do not use the unit in dusty or humid environments.
• Do not use abrasive cleaners. To clean, use a soft, dry cloth.
• Excessive sound pressure from earphones and headphones can cause hearing loss.
• The marking information for the product is located at the bottom of the apparatus.
• This product must not be disposed of with household waste. It should be recycled at an authorized collection point for electrical and electronic equipment.