In the telecommunications industry, a scrambler is known as a device that can manipulate data stream before transmission. Voice scramblers are very useful for a variety of reasons:

1.They are equipped with different kinds of voices that can range from normal, man to woman and vice versa, young to old, robot, etc.
2.They mask your voice to make it unrecognizable; ideal for kids who are home alone.
3.They can make unwanted phone calls short by faking a kid crying in the background.
4.They can make it seem you are not home alone with a fake dog bark or a ringing bell at the press of a button