NEEWER CM28 Wireless Lavalier Microphone System User Manual

1. Introduction

The NEEWER CM28 Wireless Lavalier Microphone System is designed for high-quality audio recording across various platforms, including cameras, smartphones, and computers. This system features two transmitters (TX) and one receiver (RX), housed in a portable charging case. Key functionalities include smart noise cancelling, uncompressed audio recording, and a stable wireless transmission range.

Image 1.1: The NEEWER CM28 Wireless Lavalier Microphone System, showing the two transmitters and one receiver within their charging case.

2. Package Contents

Verify that all items listed below are included in your package:

• 2 x Transmitters (TX)
• 1 x Receiver (RX)
• 1 x Charging Case
• 2 x OTG Adapters (Type C to Type C, Type C to Lightning)
• 2 x Magnets
• 2 x Furry Windshields
• 1 x Camera Audio Cable (3.5mm TRS)
• 1 x USB A to Type C Data Cable (for PC/MAC transmission)
• 1 x Storage Bag

Image 2.1: All included components of the NEEWER CM28 system, including transmitters, receiver, charging case, cables, adapters, and accessories.

3. Product Overview

The CM28 system consists of compact and lightweight units designed for ease of use and portability.

3.1 Transmitters (TX)

• Each TX unit features a built-in microphone and a 4GB internal storage for standalone recording.
• Equipped with a power/noise cancelling button and an LED indicator.
• Can be clipped onto clothing or attached magnetically.

3.2 Receiver (RX)

• The RX unit connects to your recording device (camera, phone, PC).
• Features an LCD screen displaying modes, volume, battery levels, connection status, and noise reduction.
• Includes a 3.5mm headphone jack for real-time audio monitoring.

3.3 Charging Case

• Provides protection and recharges the TX and RX units.
• Can fully charge the units twice, extending operational time.

Image 3.1: A detailed view of the individual components: two transmitters, one receiver, and the open charging case.

4. Setup

4.1 Initial Charging

1. Place the TX and RX units into the charging case.
2. Connect the charging case to a power source using the provided USB-C cable.
3. The TX and RX units require approximately 1.5 hours for a full charge. The charging case itself takes about 2 hours to fully charge.

4.2 Power On/Off

• To power on, press and hold the power button on each TX and RX unit.
• To power off, press and hold the power button again.

4.3 Pairing

The TX and RX units are pre-paired at the factory. If re-pairing is necessary:

1. Ensure both TX and RX units are powered on.
2. The units should automatically connect. The RX screen will display connection status.
3. If connection fails, refer to the troubleshooting section or consult the quick start guide for specific pairing instructions.

Image 4.1: Visual representation of the integrated wireless audio system, highlighting charging times and key features like safe track mode and one-click noise cancelling.

5. Operating Instructions

5.1 Connecting to Recording Devices

• For Smartphones (iPhone/Android): Use the appropriate Type C to Lightning or Type C to Type C OTG adapter to connect the RX unit to your phone's charging port. Ensure 'OTG' is enabled in settings for some Android phones.
• For Cameras: Use the provided 3.5mm TRS camera audio cable to connect the RX unit's output to your camera's microphone input.
• For PC/MAC: Use the Type C OTG adapter or the white USB A to Type C data cable to connect the RX unit to your computer.

5.2 Noise Cancelling

The CM28 features a smart noise cancelling function to reduce ambient noise.

• To activate/deactivate noise cancelling, click the power button on the TX unit.
• A blue steady light indicates noise cancelling is active.

Image 5.1: The transmitter unit showing the button for one-click noise cancelling and recording, along with LED indicator states.

5.3 Standalone Recording (TX Units)

Each transmitter can function as a standalone recorder with 4GB of internal storage.

• To start/stop standalone recording, press and hold the power button on the TX unit for 2 seconds.
• The TX units can store up to 9 hours of uncompressed 48KHz WAV audio files.
• To export files, connect the TX unit to a computer using the white USB A to Type C data cable.

Image 5.2: A user demonstrating standalone recording with the CM28 system, highlighting its ability to capture and store audio independently.

5.4 Output Modes (RX Unit)

The receiver supports three audio output modes: Mono, Stereo, and MS (Mid-Side).

• Tap and hold the mode switching button on the RX unit to cycle through Mono, Stereo, and MS modes.
• Mono: Merges audio from both transmitters into a single track.
• Stereo: Records audio from each transmitter as separate left and right channels for post-production flexibility.
• MS: Provides a safe track design with a 6 dB lower gain to prevent clipping and distortion.

Image 5.3: The receiver's display illustrating the three selectable audio output modes: Mono, Stereo, and MS.

5.5 Volume Adjustment (RX Unit)

• Tap the volume adjustment button on the RX unit to change the decibel (dB) gain.
• The LCD screen will display the current volume level.

5.6 Real-Time Monitoring

Connect headphones to the 3.5mm jack on the RX unit to monitor audio in real-time during recording.

Image 5.4: The receiver unit with headphones connected, demonstrating the real-time audio monitoring feature.

6. Features

• Professional Wireless System: Kit includes 2 transmitters (TX) and 1 receiver (RX) for versatile audio capture.
• Extended Battery Life: TX units operate for 9 hours, RX for 8 hours on a full charge. The charging case provides two additional full charges.
• Standalone Recording: Each TX unit has 4GB storage, capable of saving up to 9 hours of uncompressed 48KHz WAV audio.
• Smart Noise Cancelling: One-click activation of an advanced chip for clear audio in noisy environments.
• Multiple Audio Output Modes: Supports Mono, Stereo, and MS (Mid-Side) for flexible post-production.
• Long Range Transmission: Achieves up to 656ft (200m) of stable wireless transmission in unobstructed areas.
• Wide Compatibility: Connects to iPhone, Android phones, DSLR cameras, and PC/MAC via included adapters and cables.
• Real-Time Monitoring: 3.5mm headphone jack on the RX allows for live audio monitoring.
• Compact and Portable: Lightweight design with magnetic and clip-on options for discreet placement.

Image 6.1: A visual representation of the CM28's long-range wireless capability, showing stable transmission up to 200 meters (656 feet) in an open environment.

7. Compatibility

The NEEWER CM28 system offers broad compatibility with various devices:

• iPhone: Compatible with iPhone 11, 12, 13, 14, 15, 16 Pro Max Plus and other models using the Type C to Lightning OTG adapter.
• Android Phones: Compatible with Samsung Galaxy S23, S24 Ultra and other Android cell phones using the Type C to Type C OTG adapter. (Note: Enable "OTG" in settings for some Type C phones).
• PC/MAC: Connects via the Type C OTG adapters or the white USB A to Type C data cable for computer transmission.
• DSLR Cameras: Connects using the camera audio cable (3.5mm TRS) to the camera's MIC input.

Image 7.1: A comprehensive diagram illustrating the wide compatibility of the CM28 system with different devices and connection types.

8. Maintenance

• Cleaning: Use a soft, dry cloth to clean the units and charging case. Avoid liquid cleaners or solvents.
• Storage: Store the system in a cool, dry place away from direct sunlight and extreme temperatures. Keep units in the charging case when not in use to protect them.
• Battery Care: For optimal battery life, fully charge the units and case at least once every three months if not used regularly.

9. Troubleshooting

10. Specifications

11. Warranty and Support

For warranty information and customer support, please refer to the official NEEWER website or contact their customer service directly. Specific warranty terms may vary by region and retailer. Please retain your proof of purchase for any warranty claims.