Sennheiser SC 665 (507256) - Double-Sided Business Headset | For Mobile Phone and Tablet Connection | with HD Sound & Ultra Noise-Cancelling Microphone (Black)

I have an original SC 660 from 6 years ago, which was actually made by Sennheiser and it is magical. This is nothing similar - neither Windows nor Mac OSX recognizes it, so while i can hear, no one can hear me, or they only hear me through the laptop's mic, and I might as well be shouting from down a well. I've fiddled with audio settings, tried to download drivers, but to no avail.

Had a buzzing sound that the receiving end would hear - liked having a boom mic, but this shouldn't be rocket science!

It arrived without any of the USB connecting device with the controls. This is completely unacceptable. How do I get either the USB connecting device, or a refund.

Lightweight and great sound quality. The mic is high quality with perecft sound capture