Product highlights: 12 floors & 250,000 sq. ft. facility coverage; 3,000 acres open land coverage. Multi-Line (4 ports/line/base) for up to 90 DuraFon PRO/Walkie handsets. Works w/ analog ports: PBX, VOIP, PSTN, FXS, POTS. Expandable to 8 bases & 32 line/ports. Speakerphone/wireless intercom; broadcast page (PTT) between handsets. Rugged/durable handsets for industrial use. Extended range & multi-location options. Talk time: 6 hrs; stand-by: 50 hrs. System includes 1 base, 4 DuraFon PRO handsets, 8 Li-Lon battery packs, 4 AC chargers & adaptors, 4 belt clips, 4 antennas, 4 DuraPouch holsters.