Mosidun USB Type C Headset Noise Isolating Earphone with CLDA Hi-Fi Stereo Sound In Ear Headphones with Microphone for USB-C Phones with NO 3.5MM port

While the headphones arrived promptly, they do not work at all with my Nexus 6P nor Pixel C. I have tried changing settings in the developer menu to set the USB port as an audio source but nothing comes out of these headphones. They are not registered as connected at all. Received them on 2017-04-05.