DuraFon PRO PIB Kit w/ 20M Cable Engenius long range industrial cordless phone system Multi base system 4 port/line base unit 2 Way broadcast Private handset to handset intercom Scalable and reliable Range up to 12 floors in a building, 3,000 acres ona ranch, 250,000 sq. ft. in a warehouse Multiple handsets up to 90 Multiple lines 4 ports/lines per base unit Expandable to 8 base units Ability to broadcast to handsets via analog port or line as well as from another PRO or DuraWalkie handset directly Works behind any analog port of a PBX, phone system or analog phone line Durable 6 Hours talk time, 50 hours stand by time Will work with DuraWalkie handsets Optional external antenna for indoor use in warehouses and manufacturing plant or outdoor use on farms and car lots Black Includes 1 Base unit, 4 Handsets, 8 Li Ion battery packs, 4 Charging cradles with AC power adapters, 4 DuraPouches, 4 Belt clips, 1 External high gain antenna kit with 66' low loss coax cable, 1 Lightning protection kit, 4 Optimal performance antennas, 4 Low profile antennas