eppfun AK3040C Bluetooth 5.2 Transmitter Receiver User Manual

Introduction

This manual provides detailed instructions for setting up, operating, and maintaining your eppfun AK3040C Bluetooth 5.2 Transmitter Receiver. This versatile device allows you to wirelessly transmit audio from non-Bluetooth sources or receive audio from Bluetooth-enabled devices, enhancing your audio experience with low latency and high-quality sound.

Package Contents

Please check the package for the following items:

• eppfun AK3040C Bluetooth Transmitter/Receiver
• USB-C Charging Cable
• 3.5mm AUX Audio Cable

Product Overview

The eppfun AK3040C is a compact and portable device designed for seamless audio connectivity. It features a slide switch for easy mode selection (TX/OFF/RX) and indicator lights for status updates.

Setup

1. Charging the Device

Before first use, fully charge the AK3040C. Connect the provided USB-C cable to the device's charging port and the other end to a USB power source (e.g., wall adapter, computer USB port).

• Charging time: Approximately 2 hours for a full charge.
• Battery life: Up to 12 hours or more of continuous use.

2. Power On/Off and Mode Selection

The device features a TR / OFF / RX slide switch:

• Slide to TR for Transmitter Mode.
• Slide to RX for Receiver Mode.
• Slide to OFF to power off the device.

When the switch is turned on (to TR or RX), the device automatically enters pairing mode.

3. Pairing

Once the device is powered on and in either TX or RX mode, it will automatically enter pairing mode. The indicator light will flash, indicating it's ready to connect.

• For TX Mode: Ensure your Bluetooth headphones/speakers are in pairing mode. The AK3040C will search and connect.
• For RX Mode: Enable Bluetooth on your smartphone, tablet, or other audio source and select "AK3040C" from the list of available devices.

Operating Modes

Transmitter (TX) Mode

In TX mode, the AK3040C transmits audio wirelessly from non-Bluetooth devices to your Bluetooth headphones or speakers.

• Connect the AK3040C to the audio output (e.g., 3.5mm AUX jack) of your TV, PC, MP3 player, or airplane entertainment system using the provided 3.5mm audio cable.
• Slide the switch to TR.
• Put your Bluetooth headphones/speakers into pairing mode. The AK3040C will automatically connect.

Receiver (RX) Mode

In RX mode, the AK3040C receives audio wirelessly from Bluetooth-enabled devices and outputs it to wired headphones or speakers.

• Connect your wired headphones, car stereo, or home speaker system to the AK3040C's 3.5mm audio output using the provided 3.5mm audio cable.
• Slide the switch to RX.
• Enable Bluetooth on your smartphone, tablet, or other audio source and select "AK3040C" to pair.

Connecting Two Devices Simultaneously (TX Mode)

The AK3040C can connect to two Bluetooth headphones simultaneously in Transmitter (TX) mode, allowing both to output audio with low latency. Follow the TX mode pairing steps for the first device, then repeat for the second device.

Maintenance

• Keep the device clean and dry. Avoid exposure to extreme temperatures, humidity, or corrosive substances.
• Do not attempt to disassemble or modify the device, as this will void the warranty and may cause damage.
• Use only the provided charging cable or a certified USB-C cable for charging.

Troubleshooting

No Sound or Poor Audio Quality

• Ensure both the AK3040C and your connected audio device (headphones/speakers/source) are fully charged.
• Verify that the 3.5mm audio cable is securely connected to both the AK3040C and the audio source/output device.
• Check that the AK3040C is in the correct mode (TX for transmitting, RX for receiving).
• Confirm that your Bluetooth headphones/speakers are properly paired with the AK3040C (in TX mode) or that your source device is paired with the AK3040C (in RX mode).
• Adjust the volume on both the AK3040C and the connected audio device.
• Move the devices closer to each other to ensure they are within the 10m communication range.
• Restart both the AK3040C and the connected audio devices.

Difficulty Pairing

• Ensure the AK3040C is in pairing mode (indicator light flashing).
• Make sure your other Bluetooth device is also in pairing mode.
• Clear previous Bluetooth connections on both devices and attempt to pair again.
• Reduce interference by moving away from other wireless devices (Wi-Fi routers, other Bluetooth devices).

Audio Latency (Delay)

While the AK3040C supports APTX-Adaptive and APTX LL for low latency, some factors can still introduce delay:

• Ensure both the AK3040C and your connected headphones/speakers support APTX Low Latency or APTX-Adaptive codecs. If one device does not, it will default to a higher latency codec like SBC.
• The audio source itself might introduce delay (e.g., some projectors or older TVs).
• Environmental interference can affect latency.

Specifications

Safety Information

• Battery Handling: This device contains a Lithium Ion battery. Do not expose to high temperatures, puncture, or dispose of in fire. Follow local regulations for battery disposal.
• Interference: This device operates on radio frequencies and may cause interference with other wireless devices. Maintain a reasonable distance from other electronics.
• Disposal: Do not dispose of this product with household waste. Please refer to local regulations for proper electronic waste disposal.

Warranty and Support

Warranty

eppfun values your purchase experience and offers an 18-month warranty for the AK3040C. If you encounter any issues or have questions, please contact us.

Support

For any product-related inquiries or support, please contact us through the official eppfun store page. We are committed to providing prompt assistance.