Self Troubleshoot before proceed any further.
Please include the test result when resorting for email support.
1.Plug in USB, it's normal that the blue indicator blinks for a few secs and doesn't stay on.
2.Is "USB PnP Audio Device" seen by your Windows or Mac, or is recognized as unknown device?
3.If it is recognized and level meter responds when you speak, but you still don't hear audio from PC, have you select correct output device (computer or the mic) under system and software setting?
4.If computer sees it as unknown device, have you test out on a different computer? Tried to update and reinstall the unknown driver for a few times on the same computer?
Q: 1. it is not recognized by computer; 2.no sound on my Mac?
A: You can find step-by-step tutorial videos for above question on K053 problem-solving playlist: http://bit.ly/k053problemsolving
Q: Does K053 USB lapel mic work with phones?
A: Yes, it does. But you need a USB type A to type C or lightening adapter and we have confirmed that it works with: Samsung S and Note series of 7/8/9, iPhone 5-8, XS MAX, Sony Z series, Goolge Pixel 2 and Huawei Mate and P 20. If you are using model that is not listed above, as long as the released date of your phone is similar to those mentioned models, the mic should still work.
Q: Microphone doesn't work with my Skype!"
A: 1.Follow the playlist: http://bit.ly/k053problemsolving to check if K053 is working properly.
2.For Windows user, you can go to Setting→Privacy→Microphone, and set it to allow apps to access to microphone, at lasts restart computer.
3.Update Skype to latest version or re-install the latest Skype.