Here's yet another useful project for amateur DIY freaks. The FM telephone bug created by Leorick Simon will transmit all the conversation you want to listen to directly to the FM radio amplifying phone calls and allowing you to keep a record of them and even spying on others.

The simple transmitter gives frequency range of about 88MHz to 94MHz, which you can extend further by morphing the coil structure. The 200 feet of range is pretty cool.
Check out more telephone FM transmitter projects here and here.
Thanks: Leorick Simon
Via: leoricksimon