Introduction
This manual provides detailed instructions for the 1Mii M4K UHF Wireless Microphone Headset. Please read this manual carefully before use to ensure proper operation and to maximize the product's lifespan. This device utilizes advanced UHF low-power wireless transmission technology for stable and clear audio.

The 1Mii M4K UHF Wireless Microphone Headset includes a transmitter, receiver, and a flexible headset microphone.
Package Contents
Verify that all items listed below are included in your package:
- Wireless Microphone Headset x 1
- Wireless Receiver x 1
- 6.35mm Converter x 1
- 2-in-1 USB Charging Cable x 1
- User Manual x 1

The package includes one wireless microphone headset, one wireless receiver, one 6.35mm converter, one 2-in-1 USB charging cable, and one user manual.
Product Overview
Components and Features
- Transmitter: Features a high-definition display for channel and volume information.
- Receiver: Connects to your audio system.
- Headset Microphone: Built-in high-sensitivity condenser microphone for clear sound.
- 2-in-1 Design: Can be used as a headset or converted into a handheld microphone.
- UHF Technology: Ensures stable signal, no delay, no radiation, anti-interference, and anti-howling.

The versatile design allows for use as a traditional headset microphone or as a handheld microphone by detaching the headset frame.
Setup and Connection
- Charge Devices: Ensure both the wireless transmitter and receiver are fully charged before first use. Refer to the 'Charging' section for details.
- Connect Receiver: Plug the wireless receiver into the microphone input (Mic Jack) of your speaker, home stereo system, or voice amplifier. Use the provided 6.35mm converter if necessary. Note: This device is designed for Mic Jacks only, not Aux Jacks.
- Power On Transmitter: Long press the power button on the transmitter for 2 seconds. The blue light will illuminate.
- Power On Receiver: Toggle the switch of the receiver to "ON". The blue light will flash and then become solid, indicating a successful connection.
- Adjust Volume/Channel: Use the "+" and "-" buttons on the transmitter to adjust the volume and select the desired channel.

The receiver connects to a wide range of devices including audio mixers, power amplifiers, PA systems, voice amplifiers, wired speakers, desktop PCs, and laptops via 3.5mm or 6.35mm jacks. Not compatible with Android phones, iPhones, or Bluetooth speakers.

Visual instructions for pairing: long press transmitter power, toggle receiver switch to ON, and adjust volume/channel using transmitter buttons.
Setup Demonstration Video
This video demonstrates the features and setup of a 1Mii wireless microphone headset, including connection to audio systems.
Operation
Once connected, the microphone is ready for use. The transmitter's display shows the active channel and volume level. Adjust the volume as needed using the "+" and "-" buttons.
The wireless system offers a significant operating range:
- Outdoor Range: Up to 165 feet (50 meters) line of sight.
- Indoor Range: Up to 50-70 feet (20-30 meters) line of sight, without obstacles.

The microphone offers an outdoor line-of-sight range of up to 165 feet (50 meters) and an indoor range of 50-70 feet (20-30 meters) without obstacles.
Charging
Both the wireless transmitter and receiver are equipped with a 450 mAh rechargeable lithium-ion battery.
- Charging Time: Approximately 2.5 hours for a full charge.
- Working Time: Provides about 6 hours of continuous operation.
- Charging Indicator: The indicator light is red during charging and turns off when fully charged.
- Dual USB Cable: A 2-in-1 USB cable is included to charge both the transmitter and receiver simultaneously.

Both the transmitter and receiver feature a built-in 450 mAh rechargeable lithium-ion battery, providing approximately 6 hours of working time after a 2.5-hour charge. A dual USB cable is included for simultaneous charging.
Usage Scenarios
The 1Mii M4K Wireless Microphone is suitable for a variety of applications:
- Meetings
- Classrooms and Lectures
- Fitness and Yoga Instruction
- Tour Guiding
- Public Address (PA) Systems
The headset's ergonomic design ensures stability and comfort, making it ideal for active use.
Specifications
| Feature | Detail |
|---|---|
| Brand | 1Mii |
| Model Name | M4K |
| Connectivity Technology | Wireless (UHF) |
| Connector Type | 3.5 mm Jack, 6.35 mm Jack |
| Microphone Form Factor | Handheld & Headset (2-in-1) |
| Audio Sensitivity | 42 Decibels |
| Signal-to-Noise Ratio | 96 dB |
| Power Source | Battery Powered (2 Lithium Polymer batteries included) |
| Battery Capacity | 450 mAh (Transmitter & Receiver) |
| Working Time | Approx. 6 hours |
| Charging Time | Approx. 2.5 hours |
| Transmission Range (Outdoor) | Up to 165 feet (50 meters) line of sight |
| Transmission Range (Indoor) | Up to 50-70 feet (20-30 meters) line of sight (without obstacles) |
| Material | Metal, Plastic |
| Item Weight | 3.53 ounces (100 Grams) |
| Color | Black |
| Special Feature | Not supported Android phones, iPhones, Bluetooth Speaker. |
Troubleshooting
No Sound or Receiver Blinking
If the receiver's indicator light keeps blinking or there is no sound, it may indicate a pairing issue or incorrect connection.
- Check Connection: Ensure the receiver is plugged into a Mic Jack, not an Aux Jack.
- Re-pair Devices:
- With only the transmitter powered on, press the power button once or twice until the display shows 'H**' (channel selection).
- Use the '+' and '-' buttons to select a desired channel.
- While on the desired channel, hold down both the '+' and '-' buttons until the display shows '---'.
- Immediately turn on the receiver. It should flash a few times, then go solid, indicating successful re-pairing.
- Volume Levels: Ensure both the microphone's volume and the connected speaker/amplifier's volume are adequately adjusted.
Warranty and Support
The 1Mii M4K UHF Wireless Microphone Headset comes with a 1-Year Warranty and supports unconditional returns.
For any questions or assistance, please contact 1Mii customer support. We aim to resolve your problem within 12 hours.





