Shure SLX4L Wireless Receiver with Logic Output， G4<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"> Optional logic functionality for software echo cancellation and remote battery life monitoring (SLX4L only) </span></li><li><span class="a-list-item"> SLX Wireless Systems feature the patented Audio Reference Commanding for crystal-clear sound beyond the limits of conventional wireless technology </span></li><li><span class="a-list-item"> Automatic Frequency Selection </span></li><li><span class="a-list-item"> Automatic Transmitter Setup </span></li><li><span class="a-list-item"> 960 Selectable frequencies across 24 MHz bandwidth </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41yp1h8%2BN5L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41GAgFIS-uL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/81lzMGIXTVS.png" noproxy>