# Qudelix-5K #### **Blue LED Behavior** The **Blue LED** on the Qudelix-5K blinks whenever the device receives a command from the connected source device. When **Absolute Volume Control** is supported, adjusting the volume on the source device (e.g., a smartphone) sends a **volume command** to the 5K. Upon receiving this command, the 5K processes it and briefly blinks the Blue LED to indicate **active communication** between the source device and the 5K. *** #### **When Absolute Volume Is Not Supported** If the source device does **not send volume commands** to the sink device (the 5K), the 5K does not receive any volume control information.\ In this case, the **Blue LED will not blink**, since no command is being transmitted from the source. When Absolute Volume is not supported, the source device controls the playback volume by **scaling the digital audio signal** before transmission.\ To achieve the best sound quality, set the **source device’s volume to the maximum level** to preserve the original bit resolution of the digital signal. --- # 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://doc-kr.qudelix.com/general/absolute-volume/qudelix-5k.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.