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TSO headset question...

U-I pilot

Dec 3, 2002
Total Time
I just got a new Headset that is currently not TSO'd. (The Clarity aloft headset) It should get TSO certification within 6 months. In the mean time, what are the limitations or other things I should know about using a headset without TSO.
Right now I am not with an airline but hopefully will be....what are the requirements for 121/135 and alike?
This is a new realm I dont know much about.