The LT-PMS-4 Planar Magnetic Surface Array can be used for hailing and warning, crowd control, disasters, search and rescue, or to determine intent at very long distances. 4 MAD1 Planar Magnetic Transducers are loaded with 500Hz waveguides for increased output and control of the midrange. LT-PMS-4 has amazing clarity and provides perfect voice intelligbility regardless of the sound throw distance. Portable, battery-powered Surface Array. This device can operate at an effective distance up to 3,300 ft (80dB @ 3KHz- subject to environmental and atmospheric conditions). This system is plug and play ready, requires no major assembly or integration prior to evaluation, and is currently commercially available.