It is almost a perfect talkback microphone for professional usage.
Good sound, built like a tank. I have only 2 little problems...
1. mode settings (push to talk, momentary, etc.) available with DIP switches inside the device. I need to dismantle the mic to reach these switches... Not a big deal but a bit inconvenient.
2. When I mute myself with the push button it doesn't make full mute but a very strong gain reduction. Of course it is enough practically for anything in a common control room but if I shout on the microphone in off position it is audible a tiny bit - (I know it's not a common behavior in professional studio :D but I like 100% solutions...).
But again, it's a very good talkback microphone for any professional usage.