KAIY C39HD

KAIY Bluetooth Receiver for Home Stereo - User Manual

Model: C39HD

Introduction

This user manual provides detailed instructions for the KAIY Bluetooth Receiver (Model C39HD). This device is designed to transform any standard sound system into a Bluetooth-ready setup, allowing seamless wireless audio streaming from your smart devices. It supports multiple audio input options including 3.5mm AUX, Optical, and Coaxial, and features TF card playback for versatile music enjoyment.

KAIY Bluetooth Receiver connected to a home stereo system with a smartphone playing music.

Image: The KAIY Bluetooth Receiver (C39HD) connected to a home stereo system, demonstrating its use for wireless music streaming from a smartphone.

What's in the Box

Please check the package contents to ensure all items are present:

  • Bluetooth Receiver (Model C39HD)
  • 3.5mm AUX Data Cable
  • Optical Data Cable
  • Coaxial Data Cable
  • Type-C Power Cable
KAIY Bluetooth Receiver with included cables: 3.5mm AUX, Optical, Coaxial, and Type-C power cable.

Image: The KAIY Bluetooth Receiver shown with its various connection cables, including 3.5mm AUX, Optical, Coaxial, and the Type-C power cable.

Product Overview

The KAIY Bluetooth Receiver is a compact and versatile audio adapter designed to bring wireless capabilities to your existing audio equipment. It features a prominent control knob with an illuminated ring, a 3D surround sound button, and multiple input/output ports for broad compatibility.

Diagram showing the KAIY Bluetooth Receiver connecting to various audio sources like phones, tablets, laptops, and outputting to home stereo, AV receiver, and car audio system.

Image: A diagram illustrating how the KAIY Bluetooth Receiver can connect to various devices (phones, tablets, laptops) and output audio to different systems (home stereo, AV receiver, car audio), highlighting its versatility.

Key Features:

  • Bluetooth 5.1: Ensures stable, low-latency, and high-fidelity audio transmission.
  • Multiple Audio Inputs: Supports 3.5mm AUX, Optical, and Coaxial connections for wide compatibility with various audio systems.
  • TF Card Playback: Allows direct music playback from a TF (MicroSD) card.
  • 3D Surround Sound: One-click activation for an immersive audio experience.
  • Compact Design: Portable size for easy placement and transport.
Image showing the compact dimensions of the KAIY Bluetooth Receiver, measuring 2.48 inches by 2.75 inches.

Image: A close-up view of the KAIY Bluetooth Receiver, highlighting its compact dimensions of 2.48 inches by 2.75 inches, demonstrating its portability.

Setup Instructions

Follow these steps to set up your KAIY Bluetooth Receiver:

  1. Connect to Power: Insert the included Type-C power cable into the DC-5V port on the receiver and connect the other end to a USB power adapter (not included) or a USB port on your audio system.
  2. Connect to Audio System:
    • For 3.5mm AUX: Use the 3.5mm AUX data cable to connect the receiver's AUX output to your speaker's 3.5mm input.
    • For Optical: Use the Optical data cable to connect the receiver's Optical output to your speaker's Optical input.
    • For Coaxial: Use the Coaxial data cable to connect the receiver's Coaxial output to your speaker's Coaxial input.
  3. Power On: The device will power on automatically once connected to power.
  4. Pair with Bluetooth Device:
    • Enable Bluetooth on your smartphone, tablet, or computer.
    • Search for available Bluetooth devices.
    • Select "C39HD" from the list to pair. A successful connection will be indicated by the illuminated ring on the control knob.
Three-step diagram showing easy setup: Plug in cables, Pair via Bluetooth on a smartphone, and Enjoy wireless music.

Image: A visual guide demonstrating the simple three-step setup process: plugging in cables, pairing the device via Bluetooth on a smartphone, and then enjoying wireless music.

Close-up images showing the 3.5mm AUX, Optical, and Coaxial input ports on the KAIY Bluetooth Receiver, emphasizing low latency and high-fidelity audio.

Image: Detailed views of the 3.5mm AUX, Optical, and Coaxial input ports on the KAIY Bluetooth Receiver, illustrating the various connection options for high-fidelity audio.

Operating Instructions

Bluetooth Audio Streaming:

Once paired, your audio from the connected Bluetooth device will stream wirelessly to your audio system through the KAIY receiver. Use your connected device to control playback (play, pause, skip tracks) and volume.

3D Surround Sound:

Press the "3D" button on the receiver to activate or deactivate the 3D surround sound effect. This feature enhances the audio experience, providing a more immersive soundstage.

Image showing the KAIY Bluetooth Receiver with the 3D button highlighted, suggesting one-click activation for 3D audio and an enhanced music experience.

Image: The KAIY Bluetooth Receiver with its "3D" button prominently displayed, indicating the one-click activation for an immersive 3D audio experience.

TF Card Playback:

Insert a TF (MicroSD) card containing your music files into the designated slot on the receiver. The device will automatically switch to TF card playback mode. Use the control knob or connected device (if applicable) to navigate tracks.

Close-up of the KAIY Bluetooth Receiver showing the TF card slot and a MicroSD card, indicating support for TF card music playback.

Image: A detailed view of the KAIY Bluetooth Receiver's TF card slot, with a MicroSD card being inserted, illustrating its capability for direct music playback from a TF card.

Volume Control:

Adjust the volume using the large control knob on the top of the receiver. Rotate clockwise to increase volume and counter-clockwise to decrease volume.

Video: An official product video demonstrating the Bluetooth receiver's function, including connection and usage. This video is provided by the seller, KAIY.

Maintenance

  • Keep the device dry. Avoid exposure to moisture or liquids.
  • Clean the device with a soft, dry cloth. Do not use abrasive cleaners or solvents.
  • Store the device in a cool, dry place when not in use.
  • Avoid dropping or subjecting the device to strong impacts.

Troubleshooting

ProblemPossible CauseSolution
No powerPower cable not connected properly or power source issue.Ensure the Type-C power cable is securely connected to both the receiver and a working USB power source.
Cannot pair via BluetoothDevice not in pairing mode, or too far from the receiver.Ensure Bluetooth is enabled on your source device and it is within 33 feet (10 meters) of the receiver. Restart both devices and try pairing again.
No sound outputIncorrect audio cable connection or wrong input selected on your audio system.Verify the audio cable (3.5mm AUX, Optical, or Coaxial) is correctly connected to both the receiver and your audio system. Ensure your audio system's input is set to the corresponding connection. Check volume levels on both the receiver and your audio system.
Sound quality is poorInterference or source audio quality.Move the receiver closer to the Bluetooth source device. Avoid placing the receiver near other electronic devices that may cause interference. Try a different audio source or cable.
TF card not playingTF card not inserted correctly or unsupported file format.Ensure the TF card is fully inserted into the slot. Check if the music files on the TF card are in a supported format (e.g., MP3).

Specifications

FeatureDetail
Model NumberC39HD
Bluetooth Version5.1
Connectivity TechnologyAuxiliary, Bluetooth, Coaxial, Optical
Wireless RangeUp to 33 feet (10 meters)
Power SourceCorded Electric (USB DC-5V)
Product Dimensions2.75 x 0.8 x 2.48 inches
Item Weight4.2 ounces
MaterialMetal, Plastic
Special Features3D Surround Sound, TF Card Playback

Warranty and Support

For warranty information and technical support, please refer to the contact details provided with your purchase or visit the official KAIY website. Keep your purchase receipt as proof of purchase for any warranty claims.

© 2025 KAIY. All rights reserved.

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