There a lot of different spying devices in the market. One is not limited to security cameras alone because there are now other modern devices that could help you in your spying activities, including listening device and voice recording equipment. Such devices are usually wireless and easy to assemble. Most of them are attached to the computer, for better sound quality. And there are also some devices which are really crafty such as an ashtray listening device which is impossible to detect that it is a spying device. One could buy these devices for as low as 30 pounds; no wonder that even a typical citizen could have such helpful tools.