101 Spy Gadgets For The Evil Genius -

: Most projects can be constructed for roughly $30 or less .

: Aimed at hobbyists and "evil geniuses" ranging from beginners to intermediate electronics enthusiasts. 101 Spy Gadgets for the Evil Genius

: Phone number decoders, "spammer jammers," and voice changers. : Most projects can be constructed for roughly $30 or less

: Sound-activated and motion-activated camera triggers. 101 Spy Gadgets for the Evil Genius