Professional style headset with boom microphoneFeatures rugged headset with an adjustable band Switchable PTT/VOX functionsBoom microphone flips up out of the way when not in useFor PTT Models 73-005A 73-030 75-400 75-501 75-785 75-786 75-810 75-820 75-822. VOX or PTT operation with 75-503 75-509 F-10 F-12 F-20 75-510XL/XLB 75-515 75-517 75-440; 75-505 and 75-507 w/22-001 adapter