1. Product Overview
The 1Mii B03 is a versatile 2-in-1 Bluetooth audio adapter, functioning as both a transmitter (TX) and a receiver (RX). It enables wireless audio streaming with high-fidelity sound and low latency, making it ideal for various home audio setups. Its robust design includes dual antennas for extended range and multiple connectivity options.
Key Features:
- Versatile TX/RX Modes: Transmit audio from your TV to Bluetooth headphones or receive audio from your mobile device to your home stereo.
- Simultaneous Wired & Wireless Audio: In TX mode, stream audio to Bluetooth headphones while simultaneously outputting to a wired soundbar or speakers.
- Extended Long Range: Achieve reliable connections up to 164 ft (50m) line-of-sight in open air and 50-80ft (15-25m) indoors.
- Crystal Sound & Low Latency: Supports aptX Low Latency and aptX HD codecs for synchronized audio and high-definition sound quality.
- Multiple Connection Options: Equipped with Optical, RCA, and 3.5mm AUX inputs/outputs for broad compatibility.
2. Package Contents
Upon unboxing your 1Mii B03, please ensure all items listed below are present:
- 1Mii B03 Bluetooth Adapter
- USB Power Cable
- 3.5mm to RCA Audio Cable
- 3.5mm Audio Cable
- Optical Cable
- Power Adapter

Figure 1: 1Mii B03 Bluetooth Adapter and its accessories, including various audio cables and power adapter.
3. Setup Guide
Follow these steps to set up your 1Mii B03 for optimal performance.
3.1. Initial Connections
- Connect Power: Plug one end of the USB power cable into the DC IN port on the 1Mii B03 and the other end into the provided power adapter. Plug the power adapter into a wall outlet.
- Connect Audio Source/Destination:
- For Transmitter (TX) Mode: Connect your TV's audio output (Optical, RCA, or 3.5mm AUX) to the corresponding input on the 1Mii B03.
- For Receiver (RX) Mode: Connect your home stereo's audio input (Optical, RCA, or 3.5mm AUX) to the corresponding output on the 1Mii B03.

Figure 2: The 1Mii B03 showing its various input and output ports for audio connections.
3.2. Mode Selection
Use the TX/RX/Bypass switch on the top of the device to select the desired mode:
- TX (Transmitter) Mode: For sending audio from a source (e.g., TV) to Bluetooth headphones/speakers.
- RX (Receiver) Mode: For receiving audio from a Bluetooth device (e.g., phone) to a wired audio system.
- Bypass Mode: Allows audio to pass through the device directly to your wired speakers without Bluetooth processing.

Figure 3: Visual representation of the 1Mii B03 operating in Transmitter (TX), Receiver (RX), and Bypass modes.
3.3. Pairing Bluetooth Devices
To pair your Bluetooth headphones or speakers with the 1Mii B03:
- Ensure the 1Mii B03 is in the correct mode (TX or RX).
- Short press the power button on the 1Mii B03 to turn it on.
- Press and hold the Bluetooth pairing button (Bluetooth icon) for 2 seconds until the TX/RX LED flashes red and blue alternately, indicating pairing mode.
- Put your Bluetooth headphones or speakers into pairing mode.
- Place the devices close to each other. Once connected, the TX/RX LED on the 1Mii B03 will turn solid blue.
Video 1: Demonstrates how to pair two Bluetooth headphones with the 1Mii B03/B03Pro.
4. Operating Instructions
4.1. Transmitter (TX) Mode
In TX mode, the 1Mii B03 transmits audio from your connected source (e.g., TV) to up to two Bluetooth headphones or speakers simultaneously. Ensure your TV's audio output is set to PCM if using the optical connection.

Figure 4: The 1Mii B03 transmitting TV audio to both Bluetooth headphones and a wired soundbar, allowing shared listening experiences.
4.2. Receiver (RX) Mode
In RX mode, the 1Mii B03 receives audio from your Bluetooth-enabled device (e.g., smartphone, tablet) and outputs it to your wired home stereo system or speakers. This allows you to stream music wirelessly to traditional audio setups.

Figure 5: A smartphone wirelessly streaming music to a home stereo system through the 1Mii B03 in Receiver mode.
4.3. Volume Control
Use the '+' and '-' buttons on the 1Mii B03 to adjust the volume of the connected Bluetooth devices.
4.4. Operational Range
The 1Mii B03 offers an extended operational range thanks to its dual antennas. This allows for greater freedom of movement while maintaining a stable audio connection throughout your home.

Figure 6: Illustration of the 1Mii B03's long-range Bluetooth capability, providing coverage across multiple rooms in a home.
Video 2: A demonstration of the 1Mii B03's long-range Bluetooth capabilities in a home environment.
5. Maintenance
To ensure the longevity and optimal performance of your 1Mii B03, follow these maintenance guidelines:
- Keep the device clean by wiping it with a soft, dry cloth. Avoid using liquid cleaners or aerosols.
- Store the device in a cool, dry place away from direct sunlight and extreme temperatures.
- Avoid dropping or subjecting the device to strong impacts.
- Do not attempt to disassemble or repair the device yourself. Refer to qualified service personnel for any repairs.
Safety Information
Please observe general safety warnings regarding handling batteries, avoiding water and heat, not using the device while sleeping or in a dangerous environment, and potential interference with other wireless devices.
6. Troubleshooting
If you encounter issues with your 1Mii B03, try the following troubleshooting steps:
- No Sound/Audio Delay:
- Ensure all cables are securely connected to the correct input/output ports.
- Verify the 1Mii B03 is in the correct TX or RX mode.
- For optical connections from TV, set the TV audio format to PCM (Dolby/DTS are not supported).
- If experiencing audio delay (latency), ensure both the 1Mii B03 and your receiving Bluetooth device support aptX Low Latency.
- Pairing Issues:
- Ensure the 1Mii B03 is in pairing mode (flashing red and blue LED).
- Place the 1Mii B03 and your Bluetooth device close to each other during pairing.
- If a device fails to pair, try resetting the 1Mii B03 to factory settings by holding down the Bluetooth button for approximately 10 seconds until all lights illuminate. This will clear all previously paired devices.
- Turn off other Bluetooth devices in the immediate area to avoid interference during pairing.
- Interference: If you experience continuous weird beeping sounds or signal dropouts, try turning off other Bluetooth devices in the immediate area, especially when in transmit mode.
7. Specifications
| Feature | Specification |
|---|---|
| Brand | 1Mii |
| Model | B03 |
| Wireless Type | Bluetooth 5.3 |
| Connectivity Technology | Bluetooth, Optical, RCA, 3.5mm AUX |
| Product Dimensions (LxWxH) | 6.15 x 3.15 x 1.86 inches |
| Item Weight | 4.4 ounces |
| Color | Black |
| Power Source | Corded Electric (5 Volts) |
| Special Feature | Lip-sync, High Definition Audio, Stream to 2 Bluetooth headphones and wired external speaker simultaneously |
8. Warranty and Support
The 1Mii B03 Bluetooth Transmitter Receiver is covered by the manufacturer's warranty. For specific warranty details, please refer to the documentation included with your product or visit the official 1Mii website.
For technical support, troubleshooting assistance, or any inquiries regarding your device, please contact 1Mii customer support. Contact information can typically be found in the product packaging or on the 1Mii official website.





