“What size jack is there for the earpiece,2.5 or 3.5 mm?”
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The headset port is 2.5 mm. It is smaller than the standard size of head set. I had one of the correct size, however it was one from a cell phone and it didn't seem compatible with the headset integrated microphone. Check with the manufacture for sure, although I believe it would work with a headphone speaker-only product and then utilizing the Walkie-Talkie microphone for the transmission. I have seen where they sell their own product, however I have not used with a headset.
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