Mic issue

Why can’t I use the microphone for calls when I plug in the 3.5mm aux-in audio cable?
CMF Headphone Pro uses a three-segment 3.5mm jack that does not support microphone input, so MIC calls are not available via the aux-in connection.
What should I do if the microphone is malfunctioning?
If the microphone adds noise that makes it difficult for others to understand you during phone calls, try the following: 1. Ensure that you have the latest firmware installed. 2. Record audio and playback to test the mics. 3. Check and confirm that no dirt is blocking any of the 3 microphones. 4. Disconnect and reconnect the earbuds. 5. Reset the device.