# Description ## Functionality Lampix uses watchers to define how web applications can be interacted with in its context. Each watcher can be thought of as behavior for the device that is translated into data for the web app. The device is capable of triggering the Watchers by using an RGB trigger (it detects the changes in a specific zone, defined by the Watcher) or a DEPTH trigger. The \[Lampix Watchers]\(../app-dev/standard-watchers.md) are actively used for detecting button presses, object movement, object height and object shape. A Custom Watcher brings the possibility of adding completely new behavior for Lampix (e.g., by implementing a \[QRCodeClassifier]\(./QRCodeDetector-implementation.md), we will be able to detect QR Codes and pass the encoded information to the web application). --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://api.lampix.co/application-development/lampixcustomwatchers/description.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.