<p>The package contains everything you need to build a computerized talking door alarm.-22-page book filled with fascinating facts about security systems-2 key cards with stickers-Circuit board with components you connect yourself-just twist wires-CaseBurglars beware! The alarm voice declares "Keep Out!" before the siren sounds.Swipe the special key to turn your alarm on. Swipe the key again to turn it off!</p>

Keep Out! Door Alarm: Build Your Own Key-Card Security System!

Ben Grossblatt

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SAY WHAT? CREATURES: REAL ANSWERS TO 100 CRAZY QUESTIONS?

QUARTO PUBLISHING GROUP

See the best price to sell, buy, or rent books by Ben Grossblatt. BookScouter helps to compare book prices from 25+ online bookstores and 30+ buyback vendors with a single search.

Books by Ben Grossblatt

See the best price to sell, buy, or rent books by Ben Grossblatt. BookScouter helps to compare book prices from 25+ online bookstores and 30+ buyback vendors with a single search.

Keep Out! Door Alarm: Build Your Own Key-Card Security System!

SAY WHAT? CREATURES: REAL ANSWERS TO 100 CRAZY QUESTIONS?