DSC WT4901 2-Way Wireless Indoor Siren<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"> Siren Output – 85dB </span></li><li><span class="a-list-item"> Siren sounds for alarms， door chimes， entry/exit delay and troubles </span></li><li><span class="a-list-item"> Transmits RF status， low battery and tamper condition </span></li><li><span class="a-list-item"> Compatible with Alexor </span></li><li><span class="a-list-item"> Front and back tamper detection </span></li><li><span class="a-list-item"> Onboard test button / 1 year battery life (typical usage) </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/31IF5nu9gtL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/312PjhZGS5L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31iBAAG4ZpL.jpg" noproxy>