24 Programmable Buttons, 12 CO and 12 Personal/Feature; 10 Fixed Buttons for (Intercom, Conference, Program, Voice Mail, Pause, Forward / Do Not Disturb, Flash/Recall, Auto Answer/Mute, Auto Dial/Store And Redial) plus 3 large buttons for Hold, Transfer and Speakerphone; Volume Control for speaker, ringer and handset; headset jack; wall mountable.