Basic Features: 1.Compatible with FSK/DTMF caller system2.50 groups incoming memories and 16 groups outgoing memories3.Blue LCD;Hands free,Music on hold4.16 groups of ringing music5.3-way Lock,lock 0,unlock and full lock(free 110,120,119,112)6.5 levels of adjustable LCD luminance7.Notdisturbing function8.Flash time:90/95/100/180/300/600/1000ms..