This is a MARANTZ M4U. It comes with a USB-A adapter, so it can be used with a PC. The microphone itself also has an on/off switch. I compared it to an identical product purchased at a different time, and I didn't notice any particular differences, so I believe the main unit is working fine. The screw that fixes the angle of the microphone on the stand has become stiff. I've maintained and retightened it, so you shouldn't need to retighten it for a while after purchase. If the angle becomes loose, you can tighten it by turning the screw clockwise with a flathead screwdriver. [Reason for Sale] I was using this for voice chat on Discord, but at some point, people started saying that my voice was quiet. I thought it was broken, so I bought a replacement of the same product. However, the same issue occurred with the new product. After reviewing the settings carefully, I realized that the settings had changed due to a PC update, and the product itself was not the problem. Therefore, I ended up with two of the same product, so I am selling one here. Thank you for looking.