1. Introduction
This manual provides essential information for the safe and efficient use of your eeTao 5V USB-C Charger, specifically designed for the Tonfarb Model A20 Digital Voice Recorder. Please read this manual thoroughly before using the product and retain it for future reference.
2. Safety Information
To ensure safe operation and prevent damage, observe the following precautions:
- Use the charger only with compatible devices, such as the Tonfarb Model A20 Digital Voice Recorder.
- Do not expose the charger to water, moisture, or extreme temperatures.
- Avoid dropping or subjecting the charger to severe impacts.
- Do not attempt to disassemble or modify the charger. This will void the warranty and may cause electrical hazards.
- Ensure the power outlet voltage is within the specified input range (100-240VAC).
- Unplug the charger from the power outlet when not in use or during electrical storms.
- The charger is equipped with Over Voltage Protection (OVP), Over Current Protection (OCP), and Short Circuit Protection (SCP) to safeguard your devices.
3. Product Overview
The eeTao 5V USB-C Charger is a reliable power supply designed to charge your Tonfarb Model A20 Digital Voice Recorder efficiently. It features a compact design and multiple safety protections.

Figure 3.1: The eeTao 5V USB-C Charger shown with a Tonfarb Model A20 Digital Voice Recorder, illustrating compatibility. The recorder itself is not included with the charger.
3.1 Key Features
- Universal Input Voltage: Supports 100-240VAC, 50/60Hz for worldwide use.
- Output: Provides stable 5.0V DC power.
- USB Type-C Connector: Ensures compatibility with the Tonfarb Model A20.
- Advanced Safety Protections: Includes Over Voltage Protection (OVP), Over Current Protection (OCP), and Short Circuit Protection (SCP).
- Durable Cable Construction: Features a coarsening core and inner insulators for enhanced durability and safety.
- Compact Design: Space-saving and portable for convenience.

Figure 3.2: Detailed view of the charger cable's internal structure, highlighting the coarsening core and inner insulators for improved performance and longevity.

Figure 3.3: The compact dimensions of the eeTao charger, illustrating its space-saving design for easy portability and use in various settings.

Figure 3.4: The eeTao charger displaying its comprehensive safety features, including protection against over temperature, overcurrent, short circuits, overcharge, overpower, and overvoltage.
4. Setup
Follow these steps to set up your eeTao 5V USB-C Charger:
- Unpack the charger and inspect it for any visible damage.
- Locate a standard wall power outlet (100-240VAC).
- Plug the charger's AC prongs into the wall outlet.
- Connect the USB Type-C end of the charger cable to the charging port of your Tonfarb Model A20 Digital Voice Recorder.
- Ensure a secure connection at both ends.
5. Operating Instructions
Once connected, the charger will automatically begin supplying power to your Tonfarb Model A20 Digital Voice Recorder.
- The charging indicator on your Tonfarb Model A20 device (if available) will typically illuminate or change status to indicate charging is in progress.
- Charging time may vary depending on the device's battery level and capacity.
- Once the device is fully charged, you may disconnect the charger. It is safe to leave the charger plugged into the wall outlet, but it is recommended to unplug it when not in use for extended periods.
- Important Note on Batteries: Rechargeable batteries are not permanent and have an average battery life of 1 to 3 years. If the battery in your Tonfarb Model A20 is damaged, it may not be able to charge properly, even with a functional charger.
6. Maintenance
Proper maintenance ensures the longevity and optimal performance of your charger:
- Keep the charger clean and free from dust. Use a soft, dry cloth for cleaning.
- Do not use liquid cleaners or abrasive materials.
- Store the charger in a cool, dry place when not in use.
- Avoid bending or crimping the cable excessively, as this can damage the internal wires.
7. Troubleshooting
If you encounter issues with your charger, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Device not charging. |
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| Slow charging. |
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| Charger feels warm. |
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8. Specifications
| Feature | Detail |
|---|---|
| Brand | eeTao |
| Model Number | HL05000900 |
| Input Voltage | 100-240VAC, 50/60Hz |
| Output Voltage | 5 Volts (DC) |
| Output Current | 0.9 Amps |
| Connector Type | USB Type C |
| Compatible Devices | Tonfarb Model A20 Digital Voice Recorder |
| Special Feature | Fast Charging, OVP, OCP, SCP Protection |
| Color | Black |
| Product Dimensions | 3 x 2 x 1 inches |
| Item Weight | 3 ounces |
9. Warranty and Support
Your eeTao 5V USB-C Charger is backed by a 30-day return policy. If you experience any issues or have questions regarding your product, please contact eeTao customer support through the retailer where you purchased the item.
For further assistance, you may visit the official eeTao store page: eeTao Store