Are you being watched without your knowledge? With our handheld radio frequency detector, you can do an instant "sweep" of your home, office or hotel room and find out for sure. Hidden cameras are almost impossible to detect with the naked eye because they are incredibly small. But our detector reads the wireless radio waves surveillance cameras transmit and alerts you with a blinking LED light and an audible alarm. The built-in sensitivity tuner automatically scans variable distances and multiple channels and its advanced circuitry eliminates background noise, minimizing false alarms. Detects nearly the entire radio broadcast spectrum from 50 MHz to 3 GHz. Only 3" long and 0.5" thick, it easily fits in pocket or case. Powered by provided button batteries.