Shure MX690=-G4 Condenser Microphone (Cardioid)<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> For this wireless system component to work， please make sure your transmitter and receiver match in frequency range (style) </span></li><li><span class="a-list-item"> Sleek， low profile design. Frequency agile， microprocessor controlled transmitter. </span></li><li><span class="a-list-item"> Bi-color status indicator. IR link to SLX receiver for automatic frequency synchronization. </span></li><li><span class="a-list-item"> Programmable mute function. Battery level indicator. </span></li><li><span class="a-list-item"> Operates on two AA batteries. Logic output for remote LED and mute control. </span></li><li><span class="a-list-item"> CommShield Technology for improved RF filtering. </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41pW968H-tL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41gw4vqlW3L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/317%2B7wMRPeL.jpg" noproxy>