The document proposes a non-electric front door alarm system that restrains intruders using a net gun. The authors researched ideas like using a clown suit, fake gun, punching bag, and gloves with springs, but concluded a net gun was the best option to restrain an intruder without harming them. They plan to test the net gun system using a house, intruder actor, and net gun, and market the product to homeowners seeking a solution after being robbed.
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