Spy Camera

A spy pen camera is a perfect example of electronic miniaturization because it contains tiny versions of larger equipment. A digital camera pen is a more advanced version of the spy pen camera that utilizes digital technology. All of the working mechanisms of this device are hidden inside a case that not only looks identical [...]

Uses of the Voice Changer

Sometimes we see witnesses to a crime being interviewed on TV. They are fully clothed, even wearing a hat. Oftentimes they are also in the shadows. This is to protect them from being recognized. And when they speak, their voice has a different kind of characteristics.
This is accomplished with the use of a [...]