Mohard Bluetooth 5.3 2-in-1 Audio Adapter J51 User Manual

1. Product Overview

The Mohard J51 Bluetooth 5.3 2-in-1 Audio Adapter is a versatile device designed to enhance your wireless audio experience. It functions as both a Bluetooth transmitter (TX) and a Bluetooth receiver (RX), allowing you to easily adapt to various audio scenarios with a simple switch.

Key Features:

• 2-in-1 Functionality: Seamlessly switch between Transmitter (TX) and Receiver (RX) modes.
• Bluetooth 5.3 Technology: Ensures stable, robust, and low-latency wireless connections with a range of up to 10 meters.
• Dual-Link Connectivity: Connect two wireless headphones simultaneously in TX mode for shared listening.
• Extended Battery Life: Up to 12 hours of continuous use on a single charge.
• Hands-Free Calling: Integrated microphone with advanced noise cancellation for clear calls in RX mode.
• One-Click Factory Reset: Simplifies troubleshooting by restoring default settings.
• Universal Compatibility: Works with a wide range of audio sources and devices via 3.5mm AUX and USB-C.

Image 1.1: The Mohard J51 Bluetooth 5.3 2-in-1 Audio Adapter, showcasing its compact design, 3.5mm audio jack, and included airplane adapter.

Image 1.2: The Mohard J51 adapter demonstrating its small, portable size, fitting easily into a pocket for convenient travel.

2. Package Contents

Please check the package for the following items:

• Mohard Bluetooth Transmitter Receiver (J51) x1
• Type-C Charging Cable x1
• Dual 3.5mm AUX Adapter (for airplane use) x1
• User Manual x1

3. Device Layout

Familiarize yourself with the buttons and ports on your Mohard J51 adapter:

• Power Button / Play/Pause: Press and hold to power on/off. Short press to play/pause audio.
• TX/RX Switch: Slide to select Transmitter (TX) or Receiver (RX) mode.
• Reset Button: Press to perform a factory reset.
• 3.5mm Audio Jack: For connecting to audio sources or output devices.
• USB-C Charging Port: For charging the device.
• Indicator Lights: Display pairing status, mode, and battery level.

4. Charging the Device

Before first use, fully charge the Mohard J51 adapter.

1. Connect the provided Type-C charging cable to the USB-C port on the adapter.
2. Connect the other end of the cable to a USB power source (e.g., wall adapter, computer USB port).
3. The indicator light will show charging status (refer to the device's LED behavior for specifics, typically red while charging, off or blue when fully charged).
4. A full charge provides up to 12 hours of continuous use.

Image 4.1: The Mohard J51 adapter highlighting its extended battery life of up to 12 hours on a single charge.

5. Setup and Pairing

5.1 Power On/Off

• Power On: Press and hold the Power button for approximately 3 seconds until the indicator light flashes.
• Power Off: Press and hold the Power button for approximately 3 seconds until the indicator light turns off.

5.2 Select Mode (TX/RX)

Slide the TX/RX switch on the side of the device to select the desired mode:

• TX (Transmitter) Mode: To send audio from a non-Bluetooth device to Bluetooth headphones/speakers.
• RX (Receiver) Mode: To receive Bluetooth audio from a smartphone/tablet and play it through wired speakers/car stereo.

5.3 Pairing in TX Mode (Transmitter)

Use TX mode to stream audio from devices like TVs, computers, or airplane entertainment systems to your Bluetooth headphones or speakers.

1. Switch the adapter to TX mode.
2. Connect the adapter's 3.5mm audio jack to the audio output port of your non-Bluetooth device (e.g., TV headphone jack, airplane audio jack). Use the dual 3.5mm AUX adapter for airplane entertainment systems if needed.
3. Place your Bluetooth headphones or speaker into pairing mode (refer to your headphone/speaker manual).
4. The adapter will automatically search for and connect to nearby Bluetooth devices. The indicator light will show a successful connection.
5. Dual Pairing: To connect a second pair of headphones, put the second device into pairing mode. The adapter supports simultaneous connection to two wireless headphones.

Image 5.1: The Mohard J51 adapter in TX mode, connected to an airplane's audio jack, enabling wireless audio streaming to Bluetooth earbuds for in-flight entertainment.

Image 5.2: Illustrates the dual-link feature, allowing two users to simultaneously connect their Bluetooth headphones to the Mohard J51 adapter and share audio from a single source.

5.4 Pairing in RX Mode (Receiver)

Use RX mode to receive Bluetooth audio from your smartphone or tablet and play it through wired speakers, car stereos, or other AUX-IN enabled devices.

1. Switch the adapter to RX mode.
2. Connect the adapter's 3.5mm audio jack to the AUX-IN port of your wired speaker, car stereo, or other audio output device.
3. Enable Bluetooth on your smartphone or tablet and search for "Mohard J51" (or similar device name) in the list of available devices.
4. Select the adapter to pair. The indicator light will confirm a successful connection.
5. Once connected, you can stream audio from your smartphone/tablet to the connected wired device.
6. Hands-Free Calling: In RX mode, the built-in microphone allows you to answer calls. Short press the Power button to answer/end a call.

Image 5.3: The Mohard J51 adapter in RX mode, connected to a car's AUX input, enabling wireless audio streaming and hands-free calls from a smartphone.

Image 5.4: A comprehensive diagram detailing the various devices compatible with the Mohard J51 adapter in both Receiver (RX) mode for audio input and Transmitter (TX) mode for audio output.

6. Operating Instructions

6.1 Basic Controls

• Play/Pause: Short press the Power button.
• Answer/End Call (RX Mode): Short press the Power button.

6.2 One-Click Factory Reset

If you encounter persistent issues or wish to clear all pairing records, you can perform a factory reset:

1. Ensure the device is powered on.
2. Press the Reset button (usually a small button that may require a pin or paperclip to press).
3. The device will reset to its original factory settings, and all previous pairing information will be cleared.

7. Important Notes

The Mohard J51 Bluetooth adapter is NOT suitable for electronic musical instruments such as guitars or pianos. It is designed for general audio transmission and reception, not for low-latency, high-fidelity instrument audio.

8. Specifications

Image 8.1: Internal view of the Mohard J51 adapter, emphasizing the Bluetooth 5.3 chip for stable and fast wireless connectivity.

9. Maintenance

To ensure the longevity and optimal performance of your Mohard J51 adapter, follow these maintenance guidelines:

• Cleaning: Wipe the device with a soft, dry cloth. Avoid using harsh chemicals or abrasive cleaners.
• Storage: Store the adapter in a cool, dry place away from direct sunlight and extreme temperatures.
• Avoid Water: Do not expose the device to water or excessive moisture.
• Handle with Care: Avoid dropping or subjecting the device to strong impacts.

10. Troubleshooting

If you encounter issues with your Mohard J51 adapter, please refer to the following common problems and solutions:

• Device Not Powering On:
  • Ensure the device is fully charged. Connect it to a power source using the Type-C cable.
  • Press and hold the Power button for at least 3 seconds.
• Unable to Pair / Connection Issues:
  • Ensure the adapter is in the correct mode (TX for transmitting, RX for receiving).
  • Make sure the adapter and the target Bluetooth device are within the 10-meter range.
  • Put both devices into pairing mode.
  • Clear previous pairing records on both devices and try pairing again.
  • Perform a One-Click Factory Reset on the adapter (see Section 6.2).
• No Audio / Poor Audio Quality:
  • Check all cable connections (3.5mm AUX) are secure.
  • Ensure the volume on both the adapter and the connected audio device is turned up.
  • Verify that the adapter is successfully paired.
  • Reduce interference by moving away from other wireless devices or obstacles.
  • Ensure the adapter is not being used with electronic musical instruments, as it is not designed for this purpose.

11. Warranty and Support

The Mohard J51 Bluetooth 5.3 2-in-1 Audio Adapter comes with a one-year after-sales service warranty from the date of purchase.

If you experience any issues or have questions regarding your product, please contact Mohard customer support through your purchase platform. Please have your order number and product model (J51) ready when contacting support for faster assistance.