Engenius AC DURAFON1X Long Range Industrial Cordless Phone System Manufacturer Part# DURAFON1X The DuraFon 1X provides the longest range of ANY cordless phone, with up to 12 floors in building penetration, 250,000 square feet of warehouse coverage, or up to 3,000 acres of range on a farm or ranch. The DuraFon 1X can also be used as a 2-way radio with handset-to-handset intercom use and broadcast capability to an entire group or one individual in the network. Up to: 12 floors in building 250,000 sq. ft. in warehouse or retail store 3,000 acres on a farm or ranch Single Line (1-ports / line per base unit) Multiple handsets (up to 9 per base unit) Each handset can work with up to 4 base units Works behind any analog port of a PBX, phone system or analog phone line Durable Reliable Ease to use 6 hours talk time, 50 hours stand-by time Optional external antenna for indoor use in warehouses and manufacturing plant or outdoor use on farms and car lots key feature: Range depends upon your local environment More power and more range than any other phone that's legal to use in the US and Canada Straight-line "open field" range has been tested at over five miles In addition to being a cordless telephone, the EnGenius DuraFon is also a full-duplex 2-way radio (walkie-talkie) which operates independently of the base unit.