Introduction
This manual provides detailed instructions for the Ainostone 3-in-1 Bluetooth 5.3 Transmitter Receiver Audio Adapter. This versatile device functions as a Bluetooth transmitter, receiver, and bypass unit, allowing you to integrate Bluetooth connectivity into various audio setups. Please read this manual thoroughly before use to ensure proper operation and to maximize your device's potential.
Product Overview
Key Features:
- 3-in-1 Functionality: Operates as a Bluetooth Transmitter (TX), Receiver (RX), and Bypass unit.
- Dual Device Connection: Connects to two Bluetooth headphones or speakers simultaneously in TX mode.
- Extended Range: Utilizes precision-tuned antennas for a stable and longer transmission range.
- LCD Display: A 1.8-inch LCD screen provides clear device name and operational status.
- Multiple Audio Inputs/Outputs: Supports Optical, 3.5mm AUX, and RCA connections.
- Volume Control: Adjustable volume for convenience.
- Automatic On/Off: Features an on/off switch for easy power management.
What's in the Box:
- Ainostone Bluetooth Adapter
- USB Type-C Power Cable
- Optical Audio Cable
- 3.5mm AUX Audio Cable
- 3.5mm to RCA Audio Cable
Setup
Follow these steps to set up your Ainostone Bluetooth Adapter:
- Power Connection: Connect the device to a power source using the provided USB Type-C cable. The device will power on automatically.
- Mode Selection: Select the desired operating mode (TX, RX, or Bypass) using the mode switch on the device.
- Device Connection: Connect the adapter to your audio source or receiving device using the appropriate cables (Optical, 3.5mm AUX, or RCA).
- TV Audio Settings (for Optical connection): If connecting to a TV via optical cable, ensure your TV's audio output is set to PCM Audio. This setting is typically found in your TV's sound or audio output menu.

Operating Modes
The Ainostone adapter supports three distinct operating modes:
1. Transmitter Mode (TX)
In TX mode, the adapter transmits audio from non-Bluetooth devices (e.g., TV, PC) to Bluetooth-enabled headphones or speakers. This allows you to enjoy audio wirelessly from devices that lack built-in Bluetooth functionality.
2. Receiver Mode (RX)
In RX mode, the adapter receives audio from Bluetooth-enabled devices (e.g., smartphone, tablet) and outputs it to wired audio systems (e.g., home stereo, wired headphones). This upgrades your traditional audio equipment with Bluetooth receiving capabilities.
3. Bypass Mode
Bypass mode allows a direct wired connection between your audio source and output device without Bluetooth processing. This is useful for listening to audio through traditional wired headphones or speakers connected via Optical, 3.5mm AUX, or RCA cables.

Display and Controls
The device features a 1.8-inch LCD display that shows the current operating mode, connected device names, and other status information. A rotary knob allows for easy navigation through menus and selection of options displayed on the screen, simplifying the connection process.

Dual Device Connection
In Transmitter (TX) mode, the Ainostone adapter can pair with and transmit audio to two Bluetooth headphones or speakers simultaneously. This feature allows two users to share audio from a single source without disturbing others.

Troubleshooting
Refer to the following common issues and their solutions:
- Q1: Cannot connect to both Optical and RCA cables simultaneously.
A: In TX/RX/Bypass modes, Optical is prioritized. If AUX is connected simultaneously with Optical, AUX will take precedence. The device automatically recognizes AUX. However, RCA cannot be used with Optical at the same time. Disconnect any unused cables to ensure proper function. - Q2: Unable to connect to my device.
A: Please confirm the following:
1. You have selected the correct operating mode (TX or RX).
2. The Bluetooth device is in pairing mode.
3. Both devices are within 1 meter (3 feet) during the pairing process. - Q3: Bluetooth audio transmitter is connected to my TV via optical, but there is no sound.
A: Verify that your TV's audio output is set to PCM. This setting is usually found under 'Settings > Sound > Digital Audio Output' on your TV. - Q4: The connection is unstable or frequently disconnects.
A: Try initializing the Bluetooth transmitter and then reconnecting. To initialize, long-press the Bluetooth identification button to disconnect, then power off and restart the device. - Q5: There is an audio delay.
A: Audio delay can be influenced by connected devices and surrounding Bluetooth devices. It is recommended to turn off other nearby Bluetooth devices and attempt to connect to different devices to determine if the issue persists. - Q6: After powering off, the device does not remember previously paired devices.
A: Initialize the Bluetooth adapter and then pair your devices again. To initialize, long-press the Bluetooth identification button to disconnect, then power off and restart the device.
Specifications
| Model Name | Type A |
| Brand | Ainostone |
| Connectivity Technology | Bluetooth 5.3, 3.5mm AUX, Optical, RCA |
| Power Source | Corded Electric (USB Type-C) |
| Material | Acrylonitrile Butadiene Styrene (ABS) |
| Color | Black + Grey |
| Display Type | LCD (1.8 inches) |
| Antenna | External antenna for improved signal range |
| Item Dimensions (LxWxH) | 8.4L x 3.3W x 1.1H cm |
| Item Weight | 130 Grams |
| Voltage | 5 Volts |
| Compatible Devices | TV, Receiver, PC, Home Stereo System, Headphones, Smartphone, MP3 Player, CD Player |
| Supported Standards | Bluetooth 5.0, MP3, WAV, WMA, AAC, FLAC |
| Number of Ports | 2 (Audio Input/Output) |
| Control Method | Touch, Rotary Knob |
Safety Information
This product utilizes Bluetooth technology for wireless connections. To minimize interference, ensure the device is kept away from other wireless devices. Handle batteries (if applicable, though this device is corded) and dispose of them according to local regulations.
Warranty and Support
Warranty:
This product comes with a 1-year warranty against manufacturer defects from the date of purchase.
Support:
For technical assistance or warranty claims, please refer to the contact information provided with your purchase or visit the official Ainostone website. Specific support contact details are not included in this manual.
