Otto V4-BA2CA1, Behind-the-head style with single left earphone. Designed for extended wear in active environments. Ultra Lightweight frame for superior comfort and fit Flexible, electret boom microphone with replaceable windscreen. Adjustable headband available on certain models. Can be worn under helmet or cap. Optional in-line PTT available. For F3, F3S, F4, F4S & F4TR. List price $77.66
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