Unfortunately, neither is the package a user manual attached, nor is finding a Planatronic on the website.
Simply plug the USB stick into the USB port not enough. One must also in the "System Settings" "Sound" "expenditure" to make changes, and also Skype requires changes in the "Settings" otherwise, although the microphone active but not the hearers. I have the "fiddle" only through eternal figured out and contacted at the end customer. This answered within a few hours (class!), As I had but it itself already found. I wonder how an elderly person is to come of it alone. A manual or installation card I would hope for the price of Planatronic already, so a PDF with instructions to harnessing the headset should be no problem.
The importance of the three knobs on the cable you have just by "trial and error" to find out. Turn down the volume and mute the microphone or another.