Safety Technology International， Inc. STI-6400 Exit Stopper Multifunction Door Alarm， Helps Prevent Unauthorized Exits or Entries Through Emergency Doors<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"> Highly visible "stop sign" design acts as a deterrent </span></li><li><span class="a-list-item"> Virtually indestructible polycarbonate housing </span></li><li><span class="a-list-item"> Detects both unauthorized exits and entries </span></li><li><span class="a-list-item"> Less expensive than heavy horizontal bar type units </span></li><li><span class="a-list-item"> 3 year guarantee against breakage of polycarbonate in normal use (one year on electro mechanical and electronic components). </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/51us8F-gcXL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41oufyY0cfL.jpg" noproxy>