1Mii B03S Bluetooth 5.3 Transmitter Receiver User Manual

1. Introduction

The 1Mii B03S is a versatile Bluetooth 5.3 audio adapter designed to enhance your TV and home stereo systems. It functions as both a transmitter (TX) and a receiver (RX), and also features a bypass mode. Equipped with an audiophile-grade SABRE DAC, it supports various high-quality audio codecs including aptX HD, aptX Low Latency, and aptX Adaptive, ensuring superior sound performance and minimal audio-video synchronization issues. The device offers multiple connectivity options, including optical, RCA, 3.5mm AUX, and a unique USB drive input.

2. What's in the Box

Image: The 1Mii B03S audio adapter and its included accessories.

The 1Mii B03S package includes the following items:

• 1Mii B03S Transmitter and Receiver Unit
• Power Adapter
• Power Cable (USB to Micro USB)
• 3.5mm AUX Cable
• 3.5mm-RCA Audio Cable
• Optical Cable
• User Manual

3. Setup Guide

3.1 Power Connection

Connect the provided power cable to the DC IN port on the 1Mii B03S and plug the power adapter into a wall outlet. The device will power on automatically.

Image: Connecting the power supply to the 1Mii B03S.

3.2 Mode Selection

The 1Mii B03S supports three operational modes: Transmitter (TX), Receiver (RX), and Bypass. Use the physical switch on the device to select the desired mode.

• TX Mode (Transmitter): Used to send audio wirelessly from your TV or other audio source to Bluetooth headphones or speakers.
• RX Mode (Receiver): Used to receive audio wirelessly from your smartphone, tablet, or computer and output it to your home stereo system or wired speakers.
• Bypass Mode: Allows audio to pass through the B03S without Bluetooth processing, useful for direct wired connections while still having the option for Bluetooth.

Image: Overview of TX, RX, and Bypass modes and their typical setups.

3.3 Connecting to Audio Sources/Devices

3.3.1 TX Mode (Connecting to TV)

To connect your TV to the B03S in TX mode, use one of the following audio output options from your TV:

• Optical Cable: Connect the optical output of your TV to the "From TV Optical In" port on the B03S.
• RCA Cable: Connect the RCA audio output (red/white) of your TV to the "From TV 3.5mm In" port on the B03S using the 3.5mm-RCA cable.
• 3.5mm AUX Cable: Connect the 3.5mm audio output of your TV (e.g., headphone jack) to the "From TV 3.5mm In" port on the B03S.

Important: When using the optical connection, ensure your TV's digital audio output format is set to PCM. RCA and 3.5mm AUX connections typically do not require this setting adjustment.

Image: Visual guide for connecting to TV and setting optical audio output to PCM.

3.3.2 RX Mode (Connecting to Amplifier/Speakers)

To connect the B03S in RX mode to your amplifier or wired speakers, use one of the following audio output options from the B03S:

• Optical Cable: Connect the "To Speaker Optical Out" port on the B03S to the optical input of your amplifier/speakers.
• RCA Cable: Connect the "To Speaker 3.5mm Out" port on the B03S to the RCA audio input (red/white) of your amplifier/speakers using the 3.5mm-RCA cable.
• 3.5mm AUX Cable: Connect the "To Speaker 3.5mm Out" port on the B03S to the 3.5mm audio input of your amplifier/speakers.

Ensure your amplifier/speakers are set to the corresponding audio input (e.g., Optical 1, AUX, CD).

3.3.3 Bypass Mode (Connecting TV to Speaker/Amplifier)

In Bypass mode, the B03S acts as a pass-through for your audio signal. This is useful if you want to use your existing wired setup while having the option to switch to Bluetooth (TX mode) without re-cabling.

• Connect your TV's audio output (Optical, RCA, or 3.5mm AUX) to the corresponding "From TV" input on the B03S.
• Connect the "To Speaker" output on the B03S (Optical, RCA, or 3.5mm AUX) to the corresponding input on your speaker or amplifier.

Note: When using the optical connection in Bypass mode, ensure your TV's digital audio output format is set to PCM.

Image: Visual guide for setting up Bypass Mode.

4. Operating Instructions

4.1 Bluetooth Pairing (TX Mode)

After selecting TX mode, the B03S will automatically enter pairing state for first use (the "TX" indicator will flash red and blue). If not, press the Bluetooth button for 2 seconds to initiate pairing.

Set your Bluetooth headphones or speakers to pairing state. The B03S will automatically search for and connect to nearby Bluetooth devices. Once successfully paired, the "TX" and "Bluetooth 1" indicators will turn blue.

Image: Step-by-step guide for easy setup in TX mode.

4.2 Bluetooth Pairing (RX Mode)

After selecting RX mode, the B03S will automatically enter pairing state for first use (the "RX" indicator will flash red and blue). If not, press the Bluetooth button for 2 seconds to initiate pairing.

On your mobile phone or tablet, turn on Bluetooth and search for the device named "B03S". Select it to connect. Once successfully paired, the "RX" and "Bluetooth 1" indicators will turn blue.

4.3 Using USB Drive Input

The 1Mii B03S supports direct playback from a USB flash drive in TX and Bypass modes. Simply insert your USB drive into the dedicated USB port on the device. The B03S will automatically detect and play audio files from the drive.

Note: USB drive input is not supported in RX (Receiver) mode. In TX & Bypass mode, when using USB drive and optical or coaxial at the same time, USB drive playback takes priority.

Image: The 1Mii B03S with a USB drive inserted, illustrating the USB input feature.

4.4 Dual Link Functionality (TX Mode)

In TX mode, the B03S can connect to two pairs of Bluetooth headphones or speakers simultaneously, allowing for shared listening experiences. After connecting the first device, press the Bluetooth button for 2 seconds again to enter pairing mode for the second device. Once the second device is paired, both "Bluetooth 1" and "Bluetooth 2" indicators will be blue.

Note: aptX Low Latency is unavailable when two headphones are connected simultaneously.

Image: Two individuals enjoying audio simultaneously via dual Bluetooth connection.

4.5 Visual Indicators

The 1Mii B03S features an intuitive indicator light panel to display its current working status and active codecs:

• TX / RX / Bypass: Indicates the active mode.
• SBC / APTX / LL / HD / AD: Indicates the active audio codec.
• Bluetooth 1 / Bluetooth 2: Indicates connected Bluetooth devices.

Image: The indicator panel of the 1Mii B03S.

5. Troubleshooting

If you encounter issues with your 1Mii B03S, please refer to the following common troubleshooting steps:

5.1 No Sound or Noise Issues (Optical Connection)

If you experience no sound or static/noise when using the optical connection, especially with a TV, ensure the TV's digital audio output format is set to PCM. Many TVs default to Dolby Digital or DTS, which are not supported by the B03S's optical input.

• Navigate to your TV's Settings menu.
• Find Sound or Audio Output settings.
• Look for Digital Output Audio Format or similar.
• Change the setting from "Auto" or "Bitstream" to PCM.

5.2 Bluetooth Connection Issues

• Ensure Pairing Mode: Make sure the B03S is in the correct TX or RX mode and its indicator is flashing red and blue, indicating pairing mode.
• Device Pairing Mode: Ensure your Bluetooth headphones/speakers/phone are also in pairing mode.
• Distance: Keep devices within the effective Bluetooth range (up to 98ft in open space, 49ft with obstacles).
• Interference: Move away from other wireless devices (Wi-Fi routers, cordless phones) that might cause interference.
• Reboot: Power cycle both the B03S and your Bluetooth device.
• Clear Pairing History: If issues persist, clear the pairing history on both the B03S (refer to user manual for specific steps) and your Bluetooth device, then attempt to pair again.

6. Specifications

Image: Detailed view of the 1Mii B03S dimensions and port labels.

7. Maintenance

To ensure the longevity and optimal performance of your 1Mii B03S, follow these maintenance guidelines:

• Cleaning: Use a soft, dry cloth to clean the device. Do not use liquid cleaners or aerosols.
• Storage: Store the device in a cool, dry place away from direct sunlight and extreme temperatures.
• Handling: Avoid dropping the device or subjecting it to strong impacts.
• Ventilation: Ensure proper ventilation around the device to prevent overheating. Do not block the ventilation openings.

8. Safety Information

Please read and adhere to the following safety precautions to prevent damage to the device or personal injury:

• Do not expose the device to liquids or extreme temperatures.
• Keep away from heat sources and avoid placing heavy objects on the device.
• Do not use the device while charging.
• Avoid placing the device near other wireless devices to prevent interference.
• Unplug the device from the power source before cleaning.
• Always follow the manufacturer's instructions for safe handling and disposal.

9. Warranty and Support

For warranty information and technical support, please refer to the official 1Mii website or contact their customer service directly. The product typically comes with a standard manufacturer's warranty. Keep your purchase receipt for warranty claims.

Online Resources:

• Official 1Mii Store: 1Mii Amazon Store
• User Guide (PDF): Download User Guide