Aha!! A pet hate of mine...
These black things we have - Jetlites - are a pile of kak. They are an improvement over the old Airlites in only one thing - they don't put your head in such a vice like grip. I always ended up with sore ears after a session with an airlite.
A few years ago I was the person on our watch who evaluated the four possible replacements for the Airlite. I distinctly remember the Jetlite being the worst of the four by quite a long way. The best was a small headset that you didn't even realise was on your head, yet the sound was crystal clear. So what did we end up with? The bloody Jetlite. So much for democracy...
As others have said, the Jetlite is extremely unreliable as well as being 'old fashioned'. I returned one after all the rubber peeled off the cable.
Of course a caring employer would provide us with a choice of headset types that would satisfy varying tastes
