| - Hearing Aid Compatible - Incoming Call Indicator(lamp) - Indicator(lamp) - Redial - Desk/Wall Mountable - Desk/Wall Mount - Ring Volume Control - Color : Red, Green, Blue- Two-line Monitoring - Billing Processing - Metering Pulse Counting - Self-time Billing - Report Printing - Daily Summary - Remote Installation - Real Time Clock - Battery Back-up Max 40 hours |