num_pages: 32
description: Enter the world of high tech security and learn the secrets behind closed circuit video, infrared and hidden cameras, and biometric systems. Build a personal door alarm and program it with a secret code. This fascinating kit includes a 32-page book with full-color illustrations, easy-to-follow directions, and all the components needed to build a personal alarm.
language: English
title: Build Your Own Digital Door Alarm: A Hands-on High Tech Book
titlecomplete: Build Your Own Digital Door Alarm: A Hands-on High Tech Book
publisher: Silver Dolphin Books