Valcom 2 Horn Speaker Paging PA System Kit (Industrial Grade) Standalone PA (Public address) System. Covers up to 12,000 Sq. ft. PER SPEAKER. 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, BUILT-IN 5 WATT AMPLIFIER MODULE, BUILT-IN VOLUME CONTROL, OMNI-DIRECTIONAL MOUNTING BASE, WALL OR ELECTRICAL BOX MOUNT, I-BEAM CLAMP INCLUDED MADE IN USA. READY TO POWER AND OPERATE OUT OF THE BOX. No additional parts required.