1. Introduction
The Anker 521 Charger (Nano Pro) is a compact and durable 40W USB-C charger designed to provide efficient power delivery for a wide range of devices. Featuring two USB-C ports, it allows for simultaneous charging with advanced safety features to protect your connected electronics.
2. What's in the Box
Upon unboxing your Anker 521 Charger (Nano Pro), you should find the following items:
- Anker 521 Charger (Nano Pro)
- Welcome Guide
Note: A charging cable is not included with this product and must be purchased separately.
3. Setup
To begin using your Anker 521 Charger (Nano Pro), follow these simple steps:
- Unpack the Charger: Carefully remove the Anker 521 Charger (Nano Pro) from its packaging.
- Locate a Power Outlet: Find a standard wall power outlet (100-240V AC, 50-60Hz).
- Plug in the Charger: Insert the charger's prongs firmly into the power outlet.
- Connect Your Device: Use a compatible USB-C charging cable (not included) to connect your device to one of the USB-C ports on the charger.

4. Operating Instructions
The Anker 521 Charger (Nano Pro) is designed for efficient charging of your devices. Understanding its power distribution is key to optimal performance.
- Single Port Charging: When only one USB-C port is in use, the charger can deliver its maximum output of 40W to the connected device. This is ideal for fast-charging compatible devices like the iPhone 13/14 series or certain iPads.
- Dual Port Charging: When both USB-C ports are in use, the 40W total output is intelligently distributed between the two connected devices. Each port will deliver up to 20W. This allows for simultaneous charging of two devices, such as an iPhone and an iPad, though the charging speed for each device will be adjusted accordingly.

Always ensure your charging cables are compatible with your devices and the charger's USB-C ports for optimal performance.
5. Safety Features
The Anker 521 Charger (Nano Pro) is equipped with Anker's advanced ActiveShield safety system to ensure the protection of your devices during charging.
- Dynamic Temperature Sensor: This sensor actively monitors the charger's temperature in real-time, preventing overheating and ensuring safe operation.
- Power Tuner Chip: This intelligent chip adjusts the power output to safeguard your connected devices from overcurrent, overvoltage, and short-circuiting.

6. Compatibility
The Anker 521 Charger (Nano Pro) is compatible with a wide range of USB-C powered devices. For optimal charging, ensure your device supports USB Power Delivery (PD).
Compatible Devices:
- iPhones: iPhone 14/14 Plus/14 Pro/14 Pro Max, iPhone 13/13 Mini/13 Pro/13 Pro Max, iPhone 12 Series, iPhone 11/11 Pro/11 Pro Max, iPhone XR
- iPads: iPad 10.2-inch, iPad Pro, iPad mini 8.3-inch, iPad Air 2021
- Samsung Galaxy: Galaxy S10, Galaxy S10+, Galaxy S10e, Galaxy Z Flip, and other USB-C compatible Galaxy devices.
- Google Pixel: Pixel 3, Pixel 3XL, Pixel 4, Pixel 4XL, Pixel 5, and other USB-C compatible Pixel devices.
- MacBooks: MacBook Air 2018 and later.
- Other Devices: Various other USB-C compatible smartphones, tablets, and accessories.

7. Specifications
| Feature | Detail |
|---|---|
| Model Number | A2038 |
| Product Dimensions | 1.37 x 1.34 x 1.8 inches |
| Item Weight | 3 ounces |
| Input Voltage | 100-240V ~ 1.0A, 50-60Hz |
| Output (Single Port) | 5.0V=3.0A (15.0W) / 9.0V=3.0A (27.0W) / 15V=2.66A (40.0W) / 20.0V=2.0A (40.0W) (40.0W Max Per Port) |
| Output (Two Ports) | 20.0W + 20.0W (40.0W Max Total Output) |
| PPS Output | 3.3V-16V = 2.5A (40W Max) |
| Total USB Ports | 2 (USB Type C) |
| Special Feature | Fast Charging, ActiveShield Safety System |
| Color | Arctic White (for this variant) |
8. Troubleshooting
If you encounter issues with your Anker 521 Charger (Nano Pro), consider the following common solutions:
- Device Not Charging:
- Ensure the charger is firmly plugged into a working wall outlet.
- Verify that the charging cable is securely connected to both the charger and your device.
- Try using a different USB-C cable to rule out a faulty cable.
- Test the charger with a different device to confirm charger functionality.
- Slow Charging:
- If two devices are connected, the 40W output is split (20W per port). For maximum speed on a single device, ensure only one device is connected.
- Confirm your device and cable support fast charging protocols (e.g., USB Power Delivery) to achieve higher speeds.
- Ensure the cable you are using is rated for the desired wattage. Lower quality cables may limit charging speed.
- Charger Overheating:
- While some warmth during charging is normal, excessive heat may indicate an issue. Disconnect the charger and devices immediately.
- Ensure the charger is used in a well-ventilated area, away from direct sunlight or heat sources.
- Avoid covering the charger during use.
- If overheating persists, discontinue use and contact customer support.
For further assistance, please refer to the Warranty & Support section.
9. Warranty & Support
The Anker 521 Charger (Nano Pro) comes with a worry-free 18-month warranty. Anker is committed to providing friendly customer service.
For warranty claims, technical support, or any product-related inquiries, please contact Anker customer service through their official website or the contact information provided in your Welcome Guide.
Please retain your proof of purchase for warranty purposes.
10. Product Videos
Video: Anker USB C Charger 40W 521 Charger Nano Pro Overview. This video provides an overview of the Anker 521 Charger (Nano Pro), highlighting its dual USB-C ports and compact design. It demonstrates connecting devices and discusses charging capabilities.
Video: Review Anker 521 USB-C 40W Charger. This review video showcases the Anker 521 USB-C 40W Charger, demonstrating its use with an iPhone and MacBook. It provides insights into its performance and features.
Video: Anker Charger Comparison Best For iPhone & MacBook Air 521. This video compares the Anker 521 Charger with other Anker chargers, focusing on its suitability for iPhone and MacBook Air charging. It highlights the charger's efficiency.







