"Although interested in electronics for many years, I thought that devices for electronic surveillance were complicated until I read this book. The book has loads of circuits diagrams that are easy to build, with a good write-up on how they work... There is no waffling or unnecessary photos of obsolete or irrelevant material, and is an excellent reference guide for any person interested in electronics. Excellent.' Reader's review from amazon.com of the first editionParticularly strong on worked examples.,Proceedings of the Institution of Mechanical Engineers,034067699XA practical and straightforward handbook, complete with circuit diagrams, ideal for security ststem installers. Containing detailed material for building your own surveillance devices- making you wonder why you hadn't tried it before!.." --International Security Buyers Guide 2002