Engenius AC Durafonpro Long Range Industrial Cordless Phone System Multiple Line Manufacturer Part# DURAFONPRO Engenius 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 Pro can also be used as a 2-way radio with handset-to-handset intercom use and broadcast capability from handset-to-handset, to an entire group or to one individual in the network. key features: Range Upto 12 floors in building Range Upto 250,000 sq. ft. in a warehouse Range Upto 3,000 acres on a farm or ranch 6 hours talk time, 50 hours stand-by time Durable