Features: 1) Two communicate lines structure 2) 3.5 screen LCD display 3) Green fluorescent screen for vision protection 4) Dialing and answering 5) Intelligent redial 6) Dial out and dial in calls on holding / retrieved 7) Caller ID, call time reckon 8) Date, time, week display 9) System state display LED indicator 10) Intercom small message 11) Two period of time alarm clock 12) Extension personal password 13) Do not disturbance 14) Working mode switch 15) Auto answer 16) Programming shortcut key 17) Telephone book 18) Call track record 19) Ordinary alkaline battery compatible 20) 12 pieces music