https://community.sony.se/t5/portable-audio/left-ear-cup-interior-has-an-indent-what-is-it-for/m-p/3837982#M11950 <P>I don't know for sure but my guess would be that it's a sensor for the automatic pause feature, allowing the headphones to detect when you have taken them off your ears.</P> Tue, 23 Nov 2021 21:01:32 GMT ArthurWellesley 2021-11-23T21:01:32Z https://community.sony.se/t5/portable-audio/left-ear-cup-interior-has-an-indent-what-is-it-for/m-p/3828792#M11851 <P>I've just started using my WH-1000XM4 headphones, and have noticed that the inside of the left earcup does not 'look' the same as the right earcup.</P><P>&nbsp;</P><P>Please see attached showing 'indented' area.<span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="iu.jpeg" style="width: 600px;"><img src="https://community.sony.se/t5/image/serverpage/image-id/477710i9AD19656C5CD8C88/image-size/medium?v=v2&amp;px=400" role="button" title="iu.jpeg" alt="iu.jpeg" /></span></P> Fri, 08 Oct 2021 19:32:44 GMT https://community.sony.se/t5/portable-audio/left-ear-cup-interior-has-an-indent-what-is-it-for/m-p/3828792#M11851 Stoobloo 2021-10-08T19:32:44Z https://community.sony.se/t5/portable-audio/left-ear-cup-interior-has-an-indent-what-is-it-for/m-p/3837982#M11950 <P>I don't know for sure but my guess would be that it's a sensor for the automatic pause feature, allowing the headphones to detect when you have taken them off your ears.</P> Tue, 23 Nov 2021 21:01:32 GMT https://community.sony.se/t5/portable-audio/left-ear-cup-interior-has-an-indent-what-is-it-for/m-p/3837982#M11950 ArthurWellesley 2021-11-23T21:01:32Z