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 4 base units- Works behind any analog port of a PBx, phone system or analog phone line- Durable & Reliable- Ease to use- 6 hours talk time, 50 hours stand-by time- Optional external antenna for indoor use in warehouses and manufacturing plant or outdoor use on farms and car lots- Expandable handset are the DURAF-PRO-HC or DURAWALKIE