System Sensor SCR SpectrAlert Advance Indoor Selectable Strobe， 12/24V， Red<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"> SpectrAlert Advance Indoor Selectable Output Strobe </span></li><li><span class="a-list-item"> Used for Ceiling Mount Applications </span></li><li><span class="a-list-item"> Plug-in design with minimal intrusion into the back box </span></li><li><span class="a-list-item"> Tamper-resistant construction </span></li><li><span class="a-list-item"> Automatic selection of 12- or 24-volt operation at 15 and 15/75 candela </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/51UuxZg-eAL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51EvfDyKnKL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51tleXi-x7L.jpg" noproxy>