Standalone PA (Public address) System. Covers up to 12,000 Sq. ft. (6,400 sq. ft. for moderately noisy environments) * Expandable with additional Horns or Ceiling Speakers * Microphone is Omni Directional Push-to-talk with switch & locking bar for Desk Paging * High-Quality rugged design that is weather resistant for indoor/outdoor use. Uses standard CAT5 cable * MADE IN USA