iON Digital Plunger Wireless Door Security Sensor， GE (Plunger-G)<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"> world's smallest concealed burglar alarm contact/transmitter </span></li><li><span class="a-list-item"> 5 year battery life CR1620 coin cell battery included </span></li><li><span class="a-list-item"> works in wood， vinyl， fiberglass and aluminum doors </span></li><li><span class="a-list-item"> 3/4" in diameter 1" deep with a 7" external antenna </span></li><li><span class="a-list-item"> Fully supervised and compatible with GE protocol wireless receivers </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/31-35atblIL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41bBO%2BOHzGL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31IemgzvO4L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31b6RO4AEFL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/3190kPnk-bL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31-35atblIL.jpg" noproxy>