Linear Z-Wave 105dB Alarm Siren with Strobe Light.
Includes AC Power Adapter with battery backup.
(WA105DBZ-1)
$19.99 plus shipping
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?Sku=YEA-102773409
Cheaper than the next least expensive Lowes.com Utilitech for $35
however lowes model is a larger unit