: The second edition also focuses on privacy, teaching users how to detect and disable snooping devices. Sample Projects The book is divided into several thematic parts:
: Infrared light converters, LED illuminators, and night vision viewers. 101 Spy Gadgets for the Evil Genius
: Phone number decoders, "spammer jammers," and voice changers. : The second edition also focuses on privacy,
: Most projects can be constructed for roughly $30 or less . 101 Spy Gadgets for the Evil Genius