Shure 514B Omnidirectional Dynamic Low Z Push-To-Talk Switch<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Frequency response designed for voice communications </span></li><li><span class="a-list-item"> Rugged， high impact ARMO-DUR case </span></li><li><span class="a-list-item"> Double-pole， single-throw PTT switch designed for constant usage </span></li><li><span class="a-list-item"> Four conductor， shielded， bare-ended (no connector) coil cord </span></li><li><span class="a-list-item"> Does not require DC power for operation </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/31-77QQUk4L.jpg" noproxy>