eBay with a$avings has the Skylink SC-100 Wireless Home Security System Deluxe Kit for $79 with free shipping. Features 110dB siren, rolling code technology, and includes control panel, motion sensor, 2 door/window contact sensors, keychain transmitter, AC adapter, batteries and mounting hardware.
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AC Adapter...so the person robbing you just needs to unplug it. Quality!
^ I suspect there's a battery backup, same as any alarm you don't want to constantly buy batteries for by having it primarily run off AC.