---
title: "Why do I get a warning on boot saying, \"You have attached an under sized power adapter to your system.\" while using my VT200?"
description: Learn why your laptop may display an undersized power adapter warning when using USB-C power passthrough with the VisionTek VT200.
---

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September 15, 2026

# Why do I get a warning on boot saying, "You have attached an under sized power adapter to your system." while using my VT200?

If you are using a third-party USB-C power adapter with the **VisionTek VT200**, your laptop may display an **"undersized power adapter"** warning if the adapter does not provide enough power for your system.

Your laptop may continue to charge, but it could charge more slowly than normal. In some cases, the available power may only be enough to reduce how quickly your battery is being depleted.

**Important**

- Use a USB-C power adapter that provides enough power for your laptop.
- Power requirements vary depending on the laptop manufacturer and model.
- An undersized power adapter may cause your laptop to charge more slowly.
- If your laptop continues to charge after the warning appears, it may be receiving reduced or slower charging power.
- The VT200 supports up to **100W of USB-C Power Delivery passthrough**, but the actual charging rate depends on the power adapter and your laptop's requirements.

For the best charging performance, use a compatible USB-C power adapter that meets or exceeds your laptop manufacturer's recommended power requirements.

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