## Introduction
The Xiaomi Home Assistant is a smart home system that integrates various devices to provide a seamless and automated living experience. However, a recent issue has been reported where the up or down buttons become unclickable when the device reaches its extreme positions.
## Problem Description
When the device is at its highest or lowest position, the corresponding button (up or down) becomes grayed out and cannot be clicked. This issue is reproducible and has been reported by multiple users.
## Reproduction Steps
To reproduce this issue, follow these steps:
1. Open the Xiaomi Home Assistant app and navigate to the device control page.
2. Click the up button until the device reaches its highest position.
3. Attempt to click the down button, but it should be grayed out and unclickable.
4. Repeat steps 1-3, but this time click the down button until the device reaches its lowest position.
5. Attempt to click the up button, but it should be grayed out and unclickable.
## Expected Behavior
The expected behavior is that the up and down buttons should be clickable at all times, regardless of the device's position. This would allow users to easily control the device and adjust its position as needed.
## Logs and System Information
The Home Assistant logs do not show any errors or issues related to this problem. The system information is as follows:
* Home Assistant Core Version: 2025.3.4
* Home Assistant Operation System Version: 15.0
* Xiaomi Home Integration Version: v0.2.4
* Device Model: lumi.airer.acn01
* Log Timezone: Asia/Shanghai
## Additional Context
The issue has been reported to occur on the lumi.airer.acn01 device model, which is a smart air purifier. The device has been updated to the latest firmware version, and the issue persists.
## Conclusion
The inability to click the up or down buttons at extreme positions is a significant issue that affects the usability of the Xiaomi Home Assistant. It is recommended that the developers investigate this issue and release a patch to fix the problem as soon as possible. In the meantime, users can try restarting the device or checking for software updates to see if the issue is resolved.