1. Introduction
The eppfun AK818 is a versatile LE Audio Wireless Bluetooth 5.4 Transmitter and Receiver designed to enhance your audio experience. It supports both transmitting and receiving audio signals, featuring LE Audio for low latency and high-quality sound, and Auracast broadcast mode for connecting multiple receivers. This device is compatible with a wide range of audio sources and output devices, making it suitable for various applications including gaming, music listening, and home entertainment.
2. Safety Information
- Handle batteries with care.
- Avoid exposure to extreme temperatures (hot or cold).
- Do not disassemble or modify the device.
- Keep the device away from water and moisture.
- May interfere with other wireless devices. Maintain a reasonable distance from other electronics.
- Use only the provided or recommended charging cables.
3. Package Contents
Verify that all items are present in the package:
- AK818 Transmitter (x1)
- AK818 Receiver (x1)
- Charging Cable (x1)
- AUX Audio Cable (x1)
4. Product Overview
The AK818 system consists of a transmitter and a receiver unit, both designed for ease of use and portability. Each unit features essential controls for power, volume, and mode selection.
4.1 Key Features
- LE Audio Support: Balances low latency (approx. 20ms) and high sound quality (24bit/96kHz).
- Auracast Broadcast Mode: Allows one transmitter to connect to multiple receivers (N receivers) with an extended range of up to 20 meters.
- Multimode Input: Supports AUX in and USB-C audio input for the transmitter.
- Receiver Upgrade: Converts wired headphones or speakers into LE Audio compatible devices via AUX output.
- Long Battery Life: Built-in batteries provide up to 12 hours of operation.
- Simple Operation: Automatic connection upon startup, with integrated volume controls.
4.2 Controls and Indicators
Both the transmitter and receiver units share similar control layouts.
Image: Close-up view of the eppfun AK818 unit, highlighting the power button (U/M), volume up (+), and volume down (-) buttons. This image illustrates the primary controls on the device.
- Power/Mode Button (U/M): Press and hold to power on/off. Short press to switch modes (Transmitter/Receiver, if applicable, or to initiate pairing).
- Volume Up (+): Increases audio volume.
- Volume Down (-): Decreases audio volume.
- LED Indicator: Provides status information (e.g., power on, pairing mode, connected, charging).
- USB-C Port: For charging and USB-C audio input (Transmitter).
- AUX Port: For 3.5mm audio input (Transmitter) or output (Receiver).
5. Setup
5.1 Charging the Device
Before initial use, fully charge both the AK818 Transmitter and Receiver units.
- Connect the provided charging cable to the USB-C port on each unit.
- Connect the other end of the charging cable to a USB power adapter (not included) or a computer's USB port.
- The LED indicator will show charging status (e.g., red while charging, off or blue when fully charged).
Image: An eppfun AK818 unit with a graphic overlay indicating "Longer Battery Life" and a 250mAh lithium battery, suggesting the charging process and battery capacity.
5.2 Powering On/Off
- To Power On: Press and hold the Power/Mode button (U/M) for approximately 3 seconds until the LED indicator lights up.
- To Power Off: Press and hold the Power/Mode button (U/M) for approximately 3 seconds until the LED indicator turns off.
5.3 Connecting the Transmitter
The AK818 Transmitter can receive audio via USB-C or AUX input.
Image: An illustration demonstrating the eppfun AK818 Transmitter connected via USB-C to various audio sources such as a phone, PS5, PC, Mac, and a game console. This highlights the USB-C input compatibility.
- USB-C Audio Input:
- Connect the USB-C cable from the AK818 Transmitter to the USB-C audio output port of your device (e.g., PC, PS5, Nintendo Switch, smartphone).
- Ensure the device's audio output is set to the AK818.
- AUX Audio Input:
- Connect the provided 3.5mm AUX audio cable from the AK818 Transmitter's AUX port to the 3.5mm audio output (headphone jack) of your device (e.g., TV, CD player, guitar, older PC).
Image: An illustration demonstrating the eppfun AK818 Transmitter connected via AUX In to various audio sources such as a TV, TV Box, phone, and guitar. This highlights the AUX input compatibility.
5.4 Connecting the Receiver
The AK818 Receiver outputs audio via its AUX port.
- Connect the provided 3.5mm AUX audio cable from the AK818 Receiver's AUX port to the 3.5mm audio input of your desired output device (e.g., wired headphones, speakers, home stereo system).
Image: An illustration showing the eppfun AK818 Receiver wirelessly receiving audio and then outputting it via AUX to headphones, a single speaker, and a home stereo system with two speakers. This demonstrates the receiver's output capabilities.
6. Operation
6.1 Automatic Connection
Once both the AK818 Transmitter and Receiver are powered on and within range, they are designed to automatically connect to each other. The LED indicators on both units will confirm a successful connection (e.g., solid blue light).
6.2 Auracast Broadcast Mode
The AK818 supports LE Audio's Auracast feature, allowing one transmitter to broadcast audio to multiple AK818 receivers simultaneously.
Image: A diagram titled "AURACAST LE AUDIO Broadcast Mode, One Transmitter Working with N Receivers." It shows a single AK818 transmitter receiving audio from a TV, laptop, or other sources via USB-C or Aux in, and then wirelessly broadcasting to multiple AK818 receivers, which are in turn connected to headphones, speakers, or other audio output devices. This visually explains the multi-receiver capability.
- Ensure all AK818 receivers are powered on and within the operating range of the transmitter (up to 20 meters in a straight line).
- The transmitter will automatically broadcast the audio, and all connected receivers will play the same audio stream.
6.3 Volume Control
Use the '+' and '-' buttons on both the transmitter and receiver units to adjust the audio volume. Adjusting volume on one unit may affect the overall output or the specific receiver's output, depending on the mode.
6.4 Low Latency Audio
The AK818 utilizes LE Audio with LC3 codec, providing a low latency experience (approximately 20ms). This is particularly beneficial for applications requiring synchronized audio and video, such as gaming or watching TV.
Image: A visual representation of a person wearing headphones and playing a video game on a TV, with the AK818 device visible. The text "30ms -LOW LATENCY" highlights the minimal audio delay, making it suitable for gaming and TV viewing.
Image: A detailed diagram showcasing an "Advanced Bluetooth 5.4 Chip" and a table comparing various audio codecs (SBC, AAC, APTX, LDAC, HWA, LC3) in terms of sampling rate and audio bits. This illustrates the high-quality audio capabilities and the role of the LC3 codec in LE Audio.
7. Specifications
| Model Name | AK818 |
| Brand | eppfun |
| Connectivity Technology | AUX, Bluetooth 5.4, USB-C |
| Special Feature | LE Audio, Low Latency, Auracast Broadcast |
| Power Source | Battery Powered (Built-in Lithium Ion) |
| Battery Life | Up to 12 hours |
| Operating Range | Up to 20 meters (straight line) |
| Supported Standards | LC3 |
| Audio Input (Transmitter) | AUX IN, USB-C |
| Audio Output (Receiver) | AUX OUT (3.5mm) |
| Compatible Devices | Car Stereo System, Headphones, Home Stereo System, Laptop, Smartphone, PC, iPad, Mac, iPhone, Android, PS5, TV, Guitar |
| Material | Plastic |
| Item Weight | 0.2 kg |
| Control Method | Buttons |
Image: A floor plan diagram illustrating the "Long Distance Operating Range" of the AK818 device, showing concentric circles indicating 5M, 10M, and 20M distances from the device within a house layout. This visually represents the effective wireless range.
8. Troubleshooting
- No Power:
- Ensure the device is fully charged.
- Verify the charging cable and power source are working correctly.
- Press and hold the Power/Mode button for 3-5 seconds to ensure it's powered on.
- No Audio Output/Input:
- Check all audio cables (AUX, USB-C) are securely connected.
- Ensure the correct input/output source is selected on your connected device.
- Adjust the volume on both the AK818 units and your connected audio devices.
- Confirm the transmitter and receiver are successfully connected (check LED indicators).
- If using USB-C audio, ensure your device supports audio output over USB-C and that the AK818 is selected as the audio output device in your system settings.
- Poor Audio Quality or Disconnections:
- Ensure the transmitter and receiver are within the recommended operating range (up to 20 meters).
- Minimize obstacles (walls, large metal objects) between the units.
- Avoid strong electromagnetic interference from other wireless devices.
- Re-power both units and allow them to reconnect.
- Auracast Not Working with Other Devices:
- The AK818's Auracast feature is designed to work with other AK818 receivers. Compatibility with third-party Auracast devices may vary.
9. Maintenance
- Clean the device with a soft, dry cloth. Do not use liquid cleaners or aerosols.
- Store the device in a cool, dry place when not in use.
- Avoid dropping or subjecting the device to strong impacts.
- Do not attempt to open or repair the device yourself. Refer to qualified service personnel.
10. Warranty and Support
The eppfun AK818 comes with a 1-year warranty from the date of purchase. This warranty covers manufacturing defects and workmanship under normal use.
The warranty does not cover:
- Damage caused by accident, abuse, misuse, flood, fire, earthquake, or other external causes.
- Damage caused by operating the product outside the permitted or intended uses described by eppfun.
- Damage caused by service performed by anyone who is not a representative of eppfun.
- Products or parts that have been modified to alter functionality or capability without the written permission of eppfun.
For technical support or warranty claims, please contact eppfun customer service through their official website or the retailer where the product was purchased. Please have your purchase receipt and product model number (AK818) ready.