The DuraFon 1X delivers unmatched wireless coverage with easy set up and usability. Engenius Durafon 1X Features: Industrial Cordless Phone System, 900 Mhz, DSS, Frequency Hopping, Unmatched Wireless Coverage: - 12 Floors in Building - 250, 000 Sq. Ft. in Warehouse - 3, 000 Acres on Ranch / Farm, 1 Analog Port per Base Unit, Supports Up To 9 Handsets per Base, Supports Up To 4 Base Units per Location/Site, 6 Hours Talk Time, 50 Hours Stand-By Time, Speakerphone, Rugged and Durable Design, Wireless PBX Function Sharing, 2.5mm Headset Jack, DuraFon PRO Includes: 1 DuraFon 1X Base Unit, 1 DuraFon 1X Handset, Li-Ion Battery Pack, AC Charging Cradle, Optimal Performance Antenna, Low Profile Antenna, Belt Clip"