Feature list: 16 Digits wide LCD display with the brightness adjustable; FSK/DTMF caller ID display, automatic checking; 24 Groups 16 digits incoming number memories; 7 Groups 16 digits outgoing number memories; One digits PABX code and 5 digits local code setup; 32 digits pre-dial and edit, support to match the incoming and outgoing number display; In-use with backlit indication; Incoming received or missed number check; The handset, headset and handsfree can be inter conversion using; Microphone mute function; 2 levels handset and headset speaker volume control; Ringer volume hi-low adjustable; Flash time 100/120/180/300/600/1000ms choice to meet the different PABX machines; Music on hold function, can mute the microphone then send the music; Power save function, no need the battery.