The Scrambler is a strap-on telephone device designed to scramble your conversations from end to end (each party must have a Scrambler set to the identical digital code). From simple monitoring of cellular phone conversations to subversive bugs and taps, the Scrambler protects your communication, and because it is fully self-contained, it can be used anywhere in the world without modification. The Scrambler employees a speech spectrum inversion technique which is digitally controlled by the unit code select switches. There are 13,122 user selectable codes in four factory code groups providing 52,488 code combinations. Operates on a standard 9-volt battery.