The Peltor MT90 throat microphone is easily worn with its elastic clip-on neckband. Often used by those who need to be able to have the face free of obstructions; as in the case of wearing a respirator. Used frequently for SWAT and tactical teams that need a mic for use with gas masks. The silicon rubber housing offers waterproof protection. Dynamic microphone is 150 ohm. Must be combined with an in-line Push-To-Talk (PTT) adapter to use with ComTac and SwatTac units.