Dtmf/fsk cli compatible, 16 - digits lcd display, 40- incoming call memory (with 10 digits), 40 - vip calls memory, 10 - outgoing call memory (with 10 digits), 16 - ring melody selectable, adjustable ringer volume control, adjustable lcd contrast, pabx code and local area code setting., mute and dnd function, two way speaker phone with adjustable volume, programmable flash time, alarm tone/pulse dialing mode selectable, anti steal dialing function and mechanical lock, pause and redial function.