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The built-in microphone on the WiiM device is used to automatically measure audio path latency when the device is connected to a receiver or speakers.

The built-in microphone is used only during the Auto Sync process in the WiiM Home app.

The measured latency is used to calibrate audio synchronization across various multi-room ecosystems, ensuring perfect timing when playing music in a group with compatible devices:

• Linkplay Multi-Room: For playback with other WiiM devices.
• Alexa Multi-Room: For playback with Amazon Echo devices and other compatible devices.
• AirPlay Multi-Room: For playback with Apple HomePod and other AirPlay speakers.
• Google Home Multi-Room: For playback with Google Nest and other Google Cast-enabled speakers.
• Roon Multi-Room: For playback with Roon Ready devices. 
• LMS Multi-Room: For playback with Squeezelite devices.  

For more information, see Adjust Audio Delay in Multi-Room Mode.