1. Product Overview
The MOUDOAUER A88T is a 2.4GHz wireless in-ear monitor system designed for musicians, studio use, and band rehearsals. It provides a high-quality, low-latency audio monitoring solution, ensuring clear and distortion-free sound transmission.
Key features include:
- High-Quality Sound: Equipped with a 2.4GHz band chip and audio processor for low noise, low latency, and 48kHz/24bit audio resolution.
- Automatic Pairing: Transmitter and receiver sync quickly upon powering on.
- Wide Compatibility: Works with mixing consoles, professional amplifiers, audio interfaces, and active speakers.
- Low Latency Monitoring: Minimal delay for real-time synchronization with live performances.
- Extended Battery Life: Up to 10 hours of continuous use.
- Stable Transmission: Reliable signal up to 30 meters (100 feet).
- Convenient Design: Receiver features a clip for easy positioning.

Figure 1: Overview of the MOUDOAUER A88T Wireless In-Ear Monitor System components.
2. What's Included
The package contains the following items:
- 1 x Transmitter
- 1 x Receiver
- 1 x Dual-ended Micro USB and Type-C combo charging cable
- 1 x Instruction Manual
- 1 x Bluetooth Transmitter (Note: This item is listed in product specifications but not in the main description's "Package Included" section. Please verify actual contents upon receipt.)
- 1 x Earphone (Note: This item is listed in product specifications but not in the main description's "Package Included" section. Please verify actual contents upon receipt.)

Figure 2: Package contents of the A88T system.
3. Setup Instructions
Follow these steps to set up your A88T Wireless In-Ear Monitor System:
- Charge the Devices: Before first use, ensure both the transmitter and receiver are fully charged. Connect the provided charging cable to the Type-C or Micro USB port on each device and a 5V USB power source. The charging indicator will show the charging status. A full charge takes approximately 1.5 hours.
- Power On: Press and hold the Power ON/OFF button on the transmitter and the Power Button on the receiver until their respective indicators light up.
- Automatic Pairing: The A88T system features automatic pairing. Upon powering on, the transmitter and receiver will automatically search for and connect to each other. The indicator lights will confirm a successful connection. No manual setup is required for pairing.
- Connect Transmitter: Plug the transmitter (with the 6.35mm jack) into the audio output of your mixing console, audio interface, amplifier, or active speaker.
- Connect Receiver and Earphones: Connect your in-ear monitors or headphones to the Headphone Port on the receiver. The receiver can be clipped to your clothing for convenience.
- Select Pickup Type (if applicable): The system supports both passive and active pickups. Observe the indicator light on the receiver:
- Green Light: Suitable for Passive Pickups.
- Blue Light: Suitable for Active Pickups.

Figure 3: Plug and Play setup with automatic pairing and pickup type indication.
4. Operating Instructions
4.1. Charging
The A88T system is equipped with a high-energy battery providing up to 10 hours of continuous use. To charge:
- Use the provided dual-ended charging cable.
- Connect the appropriate end (Type-C or Micro USB) to the charging port on the transmitter and receiver.
- Connect the USB-A end to a 5V power adapter or USB port.
- The charging indicator will illuminate during charging.
- Charging time is approximately 1.5 hours for a full charge.
- A low battery is indicated by a light flash. When the battery is full, the red light will turn off.

Figure 4: Simultaneous charging of transmitter and receiver.
4.2. Volume Adjustment
Use the Volume+ and Volume- buttons on the receiver to adjust the monitoring volume to your preferred level.
4.3. Transmission Range
The system maintains stable transmission up to 30 meters (100 feet) in an open environment. Ensure a clear line of sight between the transmitter and receiver for optimal performance.

Figure 5: Stable wireless transmission up to 100 feet (30 meters).
4.4. Multiple Units Operation
The system supports multiple pairs working at the same time (1 to 1). To avoid crosstalk, pair them one by one.
5. Maintenance
Proper maintenance ensures the longevity and optimal performance of your A88T system:
- Cleaning: Use a soft, dry cloth to clean the surfaces of the transmitter and receiver. Do not use liquid cleaners or solvents.
- Storage: Store the devices in a cool, dry place away from direct sunlight and extreme temperatures.
- Battery Care: For extended storage, charge the devices to approximately 50% every few months to preserve battery health.
- Avoid Moisture: Keep the devices away from water and high humidity.
- Handling: Handle the devices with care to avoid physical damage.
6. Troubleshooting
If you encounter issues with your A88T system, refer to the following common troubleshooting steps:
- No Sound:
- Ensure both the transmitter and receiver are powered on and fully charged.
- Verify that the transmitter is correctly plugged into the audio source and the audio source is active.
- Check that your earphones are properly connected to the receiver's headphone port.
- Adjust the volume on the receiver.
- Confirm that the transmitter and receiver are paired (indicator lights should confirm connection). If not, power cycle both devices.
- Intermittent Sound or Dropouts:
- Ensure the transmitter and receiver are within the 30-meter (100-foot) transmission range.
- Minimize obstacles (walls, large metal objects) between the transmitter and receiver.
- Avoid strong Wi-Fi signals or other 2.4GHz devices that might cause interference.
- Check battery levels; low battery can affect signal stability.
- Poor Sound Quality (Distortion, Noise):
- Ensure the audio source output level is not too high, causing input clipping on the transmitter.
- Check the quality of your earphones.
- Verify the correct pickup type is indicated (Green for Passive, Blue for Active).
- Devices Not Pairing:
- Power off both the transmitter and receiver, then power them back on. They should pair automatically.
- Ensure no other 2.4GHz devices are causing interference during the pairing process.
7. Specifications
| Feature | Specification |
|---|---|
| Model Name | A88T |
| Brand | MOUDOAUER |
| Connectivity Technology | Wireless (2.4GHz) |
| Material | Acrylonitrile Butadiene Styrene (ABS) |
| Dynamic Range | 108dB |
| Audio Resolution | 24bit / 48KHz |
| Transmission Delay | <4ms |
| Battery Capacity | 300mAh (internal) |
| Voltage | 5V |
| Charging Interface | Type-C and Micro USB |
| Charging Time | 1.5 Hours |
| Battery Life | Up to 10 Hours (Varying Based on Actual Usage) |
| Transmission Distance | 30 Meters / 100 Feet |
| Item Weight | 1.94 ounces |
| Package Dimensions | 4.33 x 1.57 x 0.59 inches |
| Specific Uses | Professional Audio Monitoring, Live Performances |
8. Safety Warnings
Please observe the following safety warnings:
- Do not mix old and new batteries.
- Do not mix alkaline, standard (carbon-zinc), or rechargeable batteries.
- Dispose of electronic waste responsibly.

Figure 6: Important safety and battery warnings.
9. Warranty and Support
Warranty information for the MOUDOAUER A88T Wireless In-Ear Monitor System is typically provided with your purchase documentation. Please refer to the warranty card or contact the retailer for specific details regarding warranty coverage and terms.
For technical support, product inquiries, or assistance with troubleshooting beyond this manual, please visit the official MOUDOAUER website or contact their customer service department. Contact information can usually be found on the product packaging or the manufacturer's website.