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It's an alarm system in a box. Plug it in to an outlet, then turn the key and remove. When the system arms, you will activate the alarm when a door is opened in it's range. The range is adjusted by the "Sensitivity" knob on the back. They are kinda cool, but tempermental in my experience.

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Halie Lockman

Lvl 13
3y ago

What else can I help you with?