ENGENIUS DURAFON PRO LONG- RANGE MULTI-LINE Expandable Cordless Phone System w/handset. The EnGenius DuraFon Long Range Industrial Cordless Phone System provides mobility and communication in demanding business environments including: large campus environments, farms, car & truck rental lots, self-storage facilities. The range is up to 12 floor building, 3000-acre farm, 250,000 sq ft warehouse or retail space. Including 4 port lines per base unit, expandable to 8 base unit, and 6 hours of talk time, with 50 hours of standby time. Works on any analog port (PBX, VOIP, PSTN, FXS OR POTS). Expandable to 8 base unit and 32 line/ports. Full duplex intercom, with auto attendant built in.