Office Telehone with caller id, OEM brand is welcomFSK/DTMF auto compatiblePress **# to convert DTMF/FSKiTalk function (one group of auto iTalk , two groups of handy iTalk )10 groups of two touch memory 35 groups of incoming and 16 groups of outgoing number memory5 levels of LCD contrast adjustable Ring volume electronic adjustableHandsfree volume electronic adjustableMusic On Hold function16 groups of ring selectable3 groups of alarm Mechanical lock Local code filterBlue LCD backlight Redial functionPre-dial functionFlash Clock