DuraFon PSL System (PRO, Single-Line) long-range cordless phone system is ideal for an add-on to the DuraFon PRO multi-line system when another port or line is needed. DURAFON-PSL Features: Coverage up to: 12 floors (office / hotel), 250,000 sq. ft. (retail store / warehouse) , or 3,000 acres (farm / ranch) Expandable up to eight (8) base units with multiple handsets (up to 9 per base unit) Works with Model # DURAFON-PRO-HC or Model # DURAFON-UHF-HC handsets Works as a stand-alone single-line system in environments that only require one line 6 hours talk time, 50 hours stand-by time Each handset can work with up to 4 base units Works behind any analog port of a PBX, phone system or analog phone line Package Includes: 1 - Phone Base unit w/ rubber antenna 1 - Base unit AC adapter 1 - Handset w/ battery cover 1 - Battery pack 1 - Low profile handset antenna 1 - High performance handset antenna 1 - Handset charging cradle 1 - Handset charging cradle AC adapter