1. Introduction
Thank you for choosing the SUNITEC BH840+ Bluetooth Headset. This manual provides detailed instructions for setting up, operating, and maintaining your headset to ensure optimal performance. Please read this manual thoroughly before use.

Image 1.1: SUNITEC BH840+ Bluetooth Headset with USB Dongle.
2. Package Contents
Verify that all items are present in your package:
- 1 x SUNITEC BH840+ Wireless Headset
- 1 x USB Dongle Adapter
- 1 x USB-C Charging Cable
- 1 x User Instruction Manual (this document)
3. Product Overview
Familiarize yourself with the components and controls of your SUNITEC BH840+ headset.

Image 3.1: Headset Controls and Ports.
- Multifunction Button: Power on/off, Play/Pause, Answer/End call.
- Volume +: Increase volume.
- Volume -: Decrease volume.
- Mute Switch/Next Song: Mute/unmute microphone, skip to next song.
- Microphone: Dual ENC noise-canceling microphones.
- Type-C/Charging Port: For charging the headset.

Image 3.2: Adjustable Ear Hook and Boom Arm.
The headset features a 180° swivel ear hook and a 270° flip-boom arm for comfortable wearing on either ear.
4. Charging the Headset
Before first use, fully charge the headset. A full charge takes approximately 1.5 hours.
- Connect the USB-C charging cable to the headset's charging port and the other end to a USB power source (e.g., computer USB port, wall adapter).
- The LED indicator will show charging status. Refer to the LED indicator section for details.
- Once fully charged, the headset provides up to 45 hours of talk time or 36 hours of music playback.

Image 4.1: Battery Life and Charging Information.
5. Setup and Pairing
5.1. Powering On/Off
- Power On: Press and hold the Multifunction Button for 3 seconds until the LED indicator flashes blue.
- Power Off: Press and hold the Multifunction Button for 5 seconds until the LED indicator flashes red and then turns off.
5.2. Bluetooth Pairing (Direct to Device)
- Ensure the headset is powered off.
- Press and hold the Multifunction Button for approximately 5-7 seconds until the LED indicator flashes red and blue alternately. This indicates pairing mode.
- On your device (smartphone, tablet, laptop with built-in Bluetooth), enable Bluetooth and search for new devices.
- Select "BH840" from the list of available devices.
- Once connected, the LED indicator will flash blue slowly.
5.3. Connecting via USB Dongle (for PC/Mac)
The included USB dongle provides a stable connection for computers without built-in Bluetooth or for optimized performance.
- Plug the USB dongle into an available USB-A port on your computer.
- Power on the BH840+ headset. It will automatically attempt to connect to the dongle.
- The LED indicator on both the headset and the dongle will turn solid blue when connected.
- Ensure the BH840+ is selected as the audio input and output device in your computer's sound settings.

Image 5.1: Stable Connection with Computer via USB Dongle.
5.4. Connecting to Two Devices Simultaneously
The BH840+ supports connecting to two Bluetooth devices at the same time (e.g., a phone and a computer via direct Bluetooth, not with the USB dongle).
- Connect the headset to the first device (e.g., your phone) as described in section 5.2.
- Turn off Bluetooth on the first device. The headset will enter pairing mode again.
- Connect the headset to the second device (e.g., your computer) as described in section 5.2.
- Turn on Bluetooth on the first device. The headset should automatically reconnect to both devices.

Image 5.2: Steps for Dual Device Connection.
6. Operating Instructions
6.1. Call Management
- Answer Call: Short press the Multifunction Button.
- End Call: Short press the Multifunction Button during a call.
- Reject Call: Press and hold the Multifunction Button for 2 seconds.
- Redial Last Number: Double-press the Multifunction Button.
6.2. Audio Playback
- Play/Pause: Short press the Multifunction Button.
- Next Track: Short press the Mute Switch/Next Song button.
- Volume Up: Short press the Volume + button.
- Volume Down: Short press the Volume - button.
6.3. Mute Function
During a call, press the Mute Switch button to mute your microphone. Press it again to unmute. A beep sound will indicate the mute status.

Image 6.1: Mute Function and Voice Assistant Activation.
6.4. Voice Assistant Activation
Triple-press the Multifunction Button to activate your device's voice assistant (e.g., Siri, Google Assistant).

Image 6.2: Activating Voice Assistant.
7. Wearing the Headset
The SUNITEC BH840+ is designed for comfortable wear on either your left or right ear.
- Adjust the ear hook to fit securely over your ear.
- Rotate the microphone boom arm up to 270° to position the microphone optimally towards your mouth.
- The ear hook can swivel 180° to switch between left and right ear wearing.
8. Compatibility
The SUNITEC BH840+ headset is compatible with a wide range of devices and platforms:
- Devices: Laptops, Desktops, Mobile Phones, Tablets.
- Operating Systems: PC (Windows), Mac.
- Communication Platforms: Microsoft Teams, Zoom, Skype, and other leading collaboration and voice platforms.

Image 8.1: Wide Device Compatibility.
9. Specifications
| Feature | Specification |
|---|---|
| Model Name | USB wireless headset BH840P |
| Connectivity Technology | Wireless (Bluetooth) |
| Wireless Communication Technology | Bluetooth 5.0 |
| Bluetooth Range | 10 Meters (33 feet) |
| Battery Life (Talk Time) | Up to 45 Hours |
| Battery Life (Music Playback) | Up to 36 Hours |
| Standby Time | Up to 60 Days |
| Charging Time | Approximately 1.5 Hours |
| Charging Port | USB-C |
| Microphone | Dual ENC Noise Cancelling |
| Item Weight | 20 Grams (0.705 ounces) |
| Product Dimensions | 2.95 x 0.39 x 2.17 inches |
| Ear Placement | Over Ear |
| Frequency Range | 20 Hz to 20,000 Hz |
10. Troubleshooting
If you encounter issues with your SUNITEC BH840+ headset, refer to the following common solutions:
- Headset not powering on: Ensure the headset is fully charged. Connect it to a power source using the USB-C cable.
- Cannot pair with device:
- Ensure the headset is in pairing mode (LED flashing red and blue alternately).
- Make sure Bluetooth is enabled on your device.
- Move the headset closer to your device.
- Try restarting both the headset and your device.
- No sound or poor sound quality:
- Check the volume levels on both the headset and your connected device.
- Ensure the headset is selected as the default audio output device in your computer's sound settings.
- If using the USB dongle, ensure it is properly inserted and recognized by your computer.
- Move away from sources of strong electromagnetic interference.
- Microphone not working:
- Ensure the microphone is not muted (check the mute switch).
- Verify the headset is selected as the default audio input device in your computer's sound settings or phone's call settings.
- Adjust the microphone boom arm closer to your mouth.
- Headset disconnects frequently:
- Ensure the headset is within the 10-meter Bluetooth range of your device.
- Avoid physical obstructions between the headset and the device.
- If using the USB dongle, ensure it is connected directly to a USB port, not through a hub if possible.
11. Maintenance
To ensure the longevity and optimal performance of your SUNITEC BH840+ headset, follow these maintenance guidelines:
- Cleaning: Use a soft, dry, lint-free cloth to clean the headset. Do not use harsh chemicals, cleaning solvents, or strong detergents.
- Storage: When not in use, store the headset in a cool, dry place, away from direct sunlight and extreme temperatures.
- Water Exposure: The headset is not water-resistant. Avoid exposure to water or excessive moisture.
- Charging: Use only the provided USB-C charging cable or a certified equivalent. Avoid overcharging the battery.
- Handling: Do not drop, disassemble, or attempt to repair the headset yourself. This may void the warranty.
12. Warranty and Support
SUNITEC offers a 12-month warranty for the BH840+ Bluetooth Headset from the date of purchase. This warranty covers manufacturing defects and workmanship under normal use.
For any questions, technical support, or warranty claims, please contact our support team. We aim to respond within 24 hours.
- Contact Information: Refer to the contact details provided on the SUNITEC official website or your purchase platform.

Image 12.1: SUNITEC Company Logo.



