[Elecraft] Which Heil Headphone is suitable?

[Karsten Eppert(DK4AS)]

I am looking for a Headset from Heil with microphone, which incorporates 
the feature of the "quiet phone" and can´t find out which one that would 
be. Can anybody give me a hint, what the products name would be and 
whether I need an additional adaptor?
At present I run my K2 with the Heil MD2 as delivered from elecraft. I 
purchased the entire K2 and MD2-set directly from elecraft, but would 
not wish to bother with importing from US only for the headset when I 
possibly can order from a local dealer.
73
Karsten