Securityman IWATCHALARMD Add-on Wireless Door/Window Sensor， White (SM-002M)<div style="text-align: left;"><strong>[Product Information]</strong><ul><li id="replacementPartsFitmentBullet" class="aok-hidden" data-doesntfitmessage="We're not sure this item fits your " data-fitsmessage="This fits your "><span class="a-list-item"><span id="replacementPartsFitmentBulletInner"><a href="#" class="a-link-normal hsx-rpp-fitment-focus">Enter your model number</a>to make sure this fits.</span></span></li><li><span class="a-list-item"> Add-on magnetic door/window sensor for IWATCHALARM series </span></li><li><span class="a-list-item"> Works with the host of any IWATCHALARM system </span></li><li><span class="a-list-item"> Magnetic contact sensor for doors &amp; windows </span></li><li><span class="a-list-item"> 1 red LED indicator lights when door/window is open </span></li><li><span class="a-list-item"> Transmits at 433MHz wireless frequency with a distance up to 200ft indoors &amp; 450ft with a clear line of sight </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/31jm4uL-lmL.jpg" noproxy>