Found
here.

The Russians have ordered six of these through Timothy Ettridge here at Quest
Air. I ordered one to test out. I tested it out on the ground and Belinda on the
receiving station said that the audio quality was poor, as though i was talking
through a tin can. Timothy said the same thing. We haven't tested it in the air.

The two cables coming out of the plug are only three feet long, so the radio had
better be close to your upper arm. Won't work in a Wills Wing Covert harness.