Long Range Acoustic Devices, most commonly known as L-RAD is a acoustic device that can transmit audio signals (sounds) to a long distance and keep it clear and undamaged. Currently they say that L-RAD can broadcast messages up to 1Km distance in its crisp clear sound.
In the early age this was used by the police as a communicating device for large crowds. Then it became a Riot controlling device with use of its built-in alarm tones.
The current product line