Safety Technology International， Inc. STI-6402 105 dB Exit Stopper Multifunction Door Alarm for Double Doors with on/off Switch and 9 Volt Battery<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"> Alarm alerts to unauthorized exits or entries through protected doors </span></li><li><span class="a-list-item"> Unit is completely self-contained and easy to install </span></li><li><span class="a-list-item"> Sounds a powerful 95 or 105 db alarm when Activated </span></li><li><span class="a-list-item"> May be mounted on top， right， left or next to almost any door </span></li><li><span class="a-list-item"> Dimensions - 5 in. diameter x 1.875 in. depth </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41jwdZuFyQL.jpg" noproxy>