KAIY C41S Bluetooth Transmitter & Receiver User Manual

1. Introduction

The KAIY C41S is a versatile 3-in-1 Bluetooth audio adapter designed to enhance your audio experience. It functions as a Bluetooth transmitter (TX), a Bluetooth receiver (RX), and supports TF card music playback. This device allows you to wirelessly stream audio from your TV or other non-Bluetooth devices to Bluetooth headphones or speakers, or to receive Bluetooth audio from your smartphone and play it through your home stereo system. Its intuitive LCD display provides clear status indicators for easy operation.

2. Safety Information

Please read and follow these safety guidelines to ensure proper use and prevent damage to the device or other equipment:

• Always follow the pairing instructions carefully to avoid damaging your headphones or other connected devices.
• Do not use this device near other sensitive electronic equipment to prevent potential interference.
• Keep the device away from water, moisture, and extreme temperatures.
• Do not attempt to disassemble or repair the device yourself. Contact customer support for assistance.
• Use only the provided cables or certified replacements to ensure optimal performance and safety.

3. Product Overview

The KAIY C41S features a compact design with an external antenna for extended range and a clear LCD display for easy monitoring of its status. Below is a diagram highlighting the key components and ports of the device.

Figure 3.1: KAIY C41S Bluetooth Transmitter & Receiver with Cables.

This image displays the KAIY C41S Bluetooth adapter from an angled perspective, showcasing its compact black body, external antenna, and LCD screen. The included optical, 3.5mm audio, and USB-C charging cables are laid out in front of the device.

Figure 3.2: KAIY C41S Device Layout with Labeled Components.

This image displays the KAIY C41S Bluetooth adapter from a top-down, slightly angled perspective. Key components are labeled with arrows: Mode Button, Previous Song button, Next Song button, LED Display, Adjust Volume/Confirm Button (rotary knob), TX/RX Mode switch, Microphone, TF Card Port, Power On/Off Button, 3.5mm Output Port, Optical Output Port, Optical Input Port, 3.5mm Input Port, and DC 5V Charging Port. An external antenna is visible on the right side.

3.3. Package Contents

• KAIY C41S Bluetooth Transmitter & Receiver
• Optical Cable
• 3.5mm Audio Cable
• USB-C Charging Cable
• User Manual (this document)

4. Setup

4.1. Powering the Device

The KAIY C41S is USB-powered. Connect the provided USB-C charging cable to the DC 5V charging port on the device and plug the other end into a USB power source (e.g., a TV's USB port, a USB wall charger, or a computer's USB port). No power adapter is included.

Figure 4.1: Powering the KAIY C41S via TV USB Port.

This image shows the KAIY C41S device placed on a TV stand, connected to the TV's USB port for power using a USB cable. The device's screen is illuminated, indicating it is powered on.

4.2. Connecting Audio Sources/Destinations

The KAIY C41S supports multiple audio connection types:

• Optical (SPDIF) Input/Output: For high-quality digital audio connections with TVs, soundbars, or home stereo systems.
• 3.5mm AUX Input/Output: For analog audio connections with headphones, speakers, or devices with a 3.5mm audio jack.

Figure 4.2: KAIY C41S Connection Diagram.

This diagram illustrates how to connect the KAIY C41S to various devices. It shows the device's rear panel with DC-5V, AUX, SPDIF IN, SPDIF OUT, and AUX ports. Arrows indicate connections: TV, Set-top Box, Projector, and Computer can connect to AUX or SPDIF IN. USB Power Supply, Laptop, and Car can provide DC-5V power. Home Stereo, Amplifiers, and Old Speakers can connect to Optical Output or AUX Output.

4.3. Initial Power On and Mode Selection

1. After connecting power, press and hold the Power ON/OFF Button (labeled in Figure 3.2) to turn on the device.
2. Use the TX/RX Switch Button (located on the side, labeled in Figure 3.2) to select the desired mode:
   • TX (Transmitter) Mode: To send audio from the C41S to Bluetooth headphones or speakers.
   • RX (Receiver) Mode: To receive Bluetooth audio from a smartphone or tablet and output it to wired speakers or a home stereo.

5. Operating Instructions

5.1. Transmitter (TX) Mode

In TX mode, the KAIY C41S transmits audio from a connected source (e.g., TV, PC) to Bluetooth-enabled headphones or speakers.

1. Ensure the device is in TX mode using the TX/RX switch.
2. Connect your audio source to the C41S using either the Optical Input or 3.5mm AUX Input.
3. Put your Bluetooth headphones or speakers into pairing mode. (Refer to your headphone/speaker manual for specific instructions. Many pairing issues occur because the headset is not in pairing mode.)
4. The C41S will automatically search for nearby Bluetooth devices. The LCD display will show "Searching..." or similar.
5. Once your device appears on the C41S display, use the Adjust Volume/Confirm Button (rotary knob) to select it and press to confirm pairing.
6. Upon successful pairing, the display will show "Connected" and the name of the connected device.

Figure 5.1: KAIY C41S Connecting to Wireless Earbuds for TV Audio.

This image shows a man and a woman sitting on a sofa, both wearing wireless earbuds and playing video games on a TV. The KAIY C41S device is on a table in front of them, connected to the TV, wirelessly transmitting audio to their earbuds. This illustrates the device's use for private listening during entertainment.

5.1.1. Dual Link Functionality

The KAIY C41S supports connecting to two Bluetooth headphones or speakers simultaneously. After successfully pairing the first device, put the second device into pairing mode and repeat steps 3-5. Both devices will then receive audio from the C41S.

Figure 5.2: Dual Link Feature in TX Mode.

This image depicts two individuals, a man and a woman, comfortably seated on a sofa, each wearing wireless headphones. They are both engaged in watching television, with the KAIY C41S device visible on a table in front of them, wirelessly transmitting audio to both sets of headphones simultaneously. This illustrates the dual link capability of the device.

5.1.2. Lip-Sync Delay

The KAIY C41S is designed to minimize lip-sync delays, providing a synchronized audio-visual experience. However, actual performance may vary depending on the connected Bluetooth headphones/speakers and the audio source.

5.1.3. Extended Range

Thanks to its external antenna, the KAIY C41S offers a reliable Bluetooth connection within a 33ft (10m) radius, allowing you to move freely without losing audio.

Figure 5.3: Long-Range Bluetooth Connection with KAIY C41S.

This image illustrates the extended range capability of the KAIY C41S. The device is shown on a table in the foreground, with a blue signal radiating outwards, covering a living room where a family is relaxing. A graphic indicates a "Long Range 33 Feet Connection," emphasizing the device's ability to maintain connectivity across a significant distance within a home environment.

5.2. Receiver (RX) Mode

In RX mode, the KAIY C41S receives Bluetooth audio from your smartphone, tablet, or other Bluetooth-enabled device and outputs it to wired speakers or a home stereo system.

1. Ensure the device is in RX mode using the TX/RX switch.
2. Connect your wired speakers or home stereo system to the C41S using either the Optical Output or 3.5mm AUX Output.
3. On your smartphone or tablet, enable Bluetooth and search for "KAIY C41S" (or similar device name) in the list of available devices.
4. Select "KAIY C41S" to pair. Upon successful pairing, the display will show "Connected" and the name of your phone/tablet.
5. Play audio on your smartphone/tablet, and it will be streamed wirelessly to your connected speakers.

Figure 5.4: KAIY C41S in RX Mode with Home Stereo.

This image shows a family in a living room, enjoying music. The KAIY C41S device is placed on a media console, connected to a home stereo system with two large speakers. A smartphone is shown wirelessly streaming music to the C41S, which then outputs the audio to the stereo, demonstrating its use as a Bluetooth receiver.

5.3. TF Card Music Player

The KAIY C41S can play audio files directly from a TF (MicroSD) card.

1. Insert a TF card containing audio files into the TF Card Port (labeled in Figure 3.2).
2. The device will automatically switch to TF card playback mode or you may need to press the Mode Switch Button to select it.
3. Use the Previous Song and Next Song buttons to navigate through tracks.
4. The audio will be output through the connected headphones/speakers (if in TX mode) or wired speakers (if in RX mode).

5.4. Volume Adjustment

The rotary knob on the KAIY C41S serves as the Adjust Volume/Confirm Button. Rotate it clockwise to increase volume and counter-clockwise to decrease volume. Press the knob to confirm selections or mute/unmute audio.

Figure 5.5: Adjusting Volume on KAIY C41S.

This image shows a hand rotating the large knob on the KAIY C41S device, with an overlay indicating volume adjustment from 16 to higher levels. The device's screen displays "Phone" and an audio equalizer graphic, suggesting active audio playback.

5.5. LCD Display Indicators

The LCD display provides real-time information about the device's status:

• Connection Mode: Indicates TX (Transmitter) or RX (Receiver) mode.
• Volume Level: Shows the current audio output volume.
• Paired Devices: Displays the names of connected Bluetooth devices.
• Current Mode: Shows the active input/output (e.g., AUX, Optical, BT, TF).
• Search Device Name: Lists discoverable Bluetooth devices during pairing.

Figure 5.6: KAIY C41S Visible Display.

This image highlights the KAIY C41S's LCD display, showing different status screens. One screen shows "TX" mode, volume "16", and "AUX" input, with "Model K2" (likely a placeholder for connected device). Another shows "RX" mode, volume "16", and "BT" input, with "Phone" as the connected device. A third screen shows "RX" mode, volume "16", and "TF" input, also with "Phone" as the connected device. This illustrates how the display clearly indicates play volume, current mode, search device name, and connected Bluetooth name.

6. Maintenance

To ensure the longevity and optimal performance of your KAIY C41S, follow these maintenance guidelines:

• Cleaning: Use a soft, dry cloth to clean the device. Avoid using liquid cleaners or abrasive materials.
• Storage: Store the device in a cool, dry place away from direct sunlight and extreme temperatures when not in use.
• Cable Care: Handle cables gently. Avoid bending or twisting them excessively, which can cause internal damage.
• Firmware Updates: Check the manufacturer's website periodically for any available firmware updates that may improve performance or add new features.

7. Troubleshooting

If you encounter issues with your KAIY C41S, please refer to the following common problems and solutions:

8. Specifications

9. Warranty and Support

9.1. Warranty Information

KAIY products are designed and manufactured to the highest quality standards. For specific warranty details, please refer to the warranty card included with your product or visit the official KAIY website. Keep your purchase receipt as proof of purchase for warranty claims.

9.2. Customer Support

If you have any questions, require technical assistance, or encounter issues not covered in this manual, please contact KAIY customer support. Contact information can typically be found on the product packaging, the official KAIY website, or through your retailer.

When contacting support, please have your product model number (C41S) and purchase details ready.

10. Product Video

Watch this official product video for a visual guide on the KAIY C41S Bluetooth Transmitter & Receiver.