Introduction
The Belker 24W Multi Voltage Universal AC DC Power Adapter is designed to provide a versatile power solution for a wide range of small household electronic devices. With adjustable voltage settings and multiple interchangeable DC connector tips, this adapter eliminates the need for numerous single-purpose power supplies. It delivers stable power output and incorporates safety features to protect your devices.
Safety Information
- Ensure the adapter's output voltage and current match your device's requirements. Incorrect settings can damage your device.
- Always verify the polarity of your device before connecting the adapter. This adapter features inner positive (+), outer negative (-) polarity. If your device requires center negative polarity, a polarity reversed cable (sold separately) is necessary.
- Do not exceed the maximum output power of 24W or 2A.
- This adapter is designed for indoor use only. Avoid exposure to moisture, high temperatures, or direct sunlight.
- Keep out of reach of children.
- Unplug the adapter from the power outlet when not in use for extended periods.
Package Contents
- 1 x Belker 24W Universal AC DC Adapter
- 1 x Switch Key for voltage adjustment
- 8 x DC Adapter Tips (including a Micro USB plug)

This image illustrates the Belker 24W Universal AC DC Adapter and a range of household electronic devices it can power, including cameras, Bluetooth speakers, routers, scales, mini fans, LED lamps, and more.
Setup Instructions
1. Select the Correct Voltage
Identify the required input voltage for your electronic device. This information is usually found on the device itself, its original power adapter, or in its user manual. The Belker adapter supports output voltages of 3V, 4.5V, 5V, 6V, 7.5V, 9V, and 12V. Use the included switch key to rotate the red dial on the adapter to the desired voltage setting. Ensure the dial clicks securely into place.

A detailed view of the adapter's voltage selector dial, which allows users to choose output voltages from 3V, 4.5V, 5V, 6V, 7.5V, 9V, to 12V using the included key.
2. Choose the Appropriate DC Connector Tip
From the assortment of included DC connector tips, select the one that physically fits your device's power input port. Gently push the chosen tip onto the adapter's output cable until it is firmly seated. Ensure a snug fit to prevent intermittent power supply.

This diagram details the dimensions of the included DC connector tips, such as 2.5x0.7mm, 4.0x1.7mm, 3.0x1.1mm, 4.8x1.7mm, 3.5x1.35mm, 5.5x2.5mm, and a Micro USB plug. It also clearly indicates the standard polarity: inner positive (+), outer negative (-).
This video demonstrates the key features of the Belker Universal AC DC Power Adapter, including its adjustable voltage settings and the variety of interchangeable DC connector tips, highlighting its versatility for different electronic devices.
3. Verify Polarity
The Belker adapter's default polarity is inner positive (+), outer negative (-). Most devices use this standard. However, some devices may require center negative polarity. Always check your device's polarity requirements. Connecting with incorrect polarity can cause irreversible damage to your device. If your device requires center negative, you will need a separate polarity reversed cable (Belker B07PMHMPMP on Amazon).
Operating Instructions
- After setting the correct voltage and attaching the appropriate tip, connect the DC output plug to your electronic device's power input port.
- Plug the AC adapter into a standard wall outlet (AC 100-240V).
- Power on your device. If the device does not power on or function correctly, immediately unplug the adapter and re-check the voltage, tip, and polarity settings.
- When finished, unplug the adapter from the wall outlet first, then disconnect it from your device.

This image shows the Belker adapter in use, plugged into a standard wall outlet and providing power to a tablet, demonstrating a typical application.
Maintenance
- Keep the adapter clean and free from dust. Wipe with a dry, soft cloth. Do not use liquid cleaners.
- Store the adapter in a cool, dry place when not in use.
- Avoid bending or crimping the power cord excessively, as this can damage internal wiring.
- Do not attempt to open or repair the adapter. Refer to qualified service personnel if damaged.
Troubleshooting
- No Power Output: Check if the adapter is securely plugged into the wall outlet. Ensure the voltage selector dial is set correctly and clicked into position. Verify the DC connector tip is firmly attached to the cable and properly inserted into your device.
- Device Not Functioning: Double-check that the selected voltage matches your device's requirements. Confirm the DC connector tip is the correct size and type for your device. Re-verify the polarity setting.
- Adapter Overheating: If the adapter feels excessively hot, immediately unplug it from the wall and your device. Ensure the device's power requirements do not exceed the adapter's 24W/2A capacity. Allow the adapter to cool down before re-use.
- Intermittent Power: Ensure all connections (wall outlet, tip to cable, tip to device) are secure and free from debris.
Specifications

This image presents a table of the adapter's power specifications, including Input (AC 100-240V, 50-60Hz), Output Voltage (DC 3-12V), Output Current (2A), Output Wattage (24W), DC Connect (5.5mm * 2.1mm), and Polarity (inner positive, outer negative).
| Feature | Detail |
|---|---|
| Model Number | WX-U40 |
| Input Voltage | AC 100-240V, 50/60Hz, 1A |
| Output Voltage | DC 3V, 4.5V, 5V, 6V, 7.5V, 9V, 12V (Adjustable) |
| Max Output Current | 2000mA (2A) |
| Max Output Wattage | 24W |
| DC Cord Length | 5 feet |
| DC Plug Polarity | Inner Positive (+), Outer Negative (-) |
| Included Tips | 9 (including Micro USB, LED Terminal Connector, various barrel sizes) |
| Material | Plastic |
| Certifications | CE, FCC, UL |

This image provides the physical dimensions of the adapter, showing its length, width, and height in both centimeters and inches. It also indicates the length of the DC cord as 5 feet.
Warranty and Support
Belker products are designed for reliability and performance. For warranty information, technical support, or assistance with your Belker 24W Multi Voltage Universal AC DC Power Adapter, please refer to the contact information provided with your purchase or visit the official Belker website. Please retain your proof of purchase for warranty claims.