Silent Call Signature Series Sidekick II Receiver with Backup Battery<div style="text-align: left;"><strong>[Product Information]</strong><ul><li class="showHiddenFeatureBullets"><span class="a-list-item"> Increased range up to 2000 feet </span></li><li class="showHiddenFeatureBullets"><span class="a-list-item"> Built in Alarm Clock </span></li><li class="showHiddenFeatureBullets"><span class="a-list-item"> Supervision of up to 3 smoke detectors </span></li><li class="showHiddenFeatureBullets"><span class="a-list-item"> Battery Backup included </span></li><li class="showHiddenFeatureBullets"><span class="a-list-item"> 5 year limited warranty </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/51OV9%2B6tu5L.jpg" noproxy>