I have 2 of the MX 300r mics. I'm going to sacrifice one to make up the headset. The locking screw piece on the bottom of the handset that locks the handset to the 4-pin cable is busted, so they won't stay together. The other on works fine and I'll keep it. If I can't shimmy the case apart, i'll crack it to get you some photos of the inside.
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