Commander Connect TELEPHONE SYSTEM (3 Months Warranty on Parts Only). Fully Refurbished Tested and Installation optional just ask. 5 Commander 8 Button Handsets included System equipped for 4 lines (PSTN) and 8 extensions (Digital). Optional - System can be expanded to 16 lines and 40 Extensions with additional modules, so this system can grow with your business when needed. (if required we can supply extra Handsets at a Cost). Also we are able to arrange installation for you.