DuraFon PRO PIA Kit w/ 4 Handsets – Engenius long range industrial cordless phone system- Multi-base system- 4 port/line base unit- 2 Way broadcast- Private handset to handset intercom- Scalable and reliable- Range up to 12 floors in a building, 3,000 acres on a ranch, 250,000 sq. ft. in a warehouse- Multiple handsets up to 90- Multiple lines 4 ports/lines per base unit – Expandable to 8 base units – Ability to broadcast to handsets via analog port or line as well as from another PRO or DuraWalkie handset directly – Works behind any analog port of a PBx, phone system or analog phone line – Durable – 6 Hours talk time, 50 hours stand-by time- Will work with DuraWalkie handsets- Optional external antenna for indoor use in warehouses and manufacturing plant or outdoor use on farms and car lots – BlackIncluded: 1 Base unit, 4 Handsets, 8 Li-Ion battery packs, 4 Charging cradles with AC adapters, 4 DuraPouches, 4 Belt clips, 4 Optimal performance handset antennas