- 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- Work as a stand-alone single-line system in environments that only require one line, but still need long-range coverage- 12 Floors ( Office / Hotel ) / 3,000 Acres ( Farm / Ranch ) / 250,000 Sq. Ft. ( Warehouse / Retail )- Single Line (1-ports / line per base unit)- Multiple handsets (up to 9 per base unit)- Each handset can work with up to