The 4412 supports all of the features of the 4406 with the following differences: 12 Programmable keys with LED 4 Display Navigation Keys, right of the display: Menu, Previous (<), Next (>), & Exit 4 Display Sof Keys below the Display 8 Fixed Feature Keys: Speaker, Mute, Conference, Transfer, Redial, Hold, Volume Up & Down 2x24 Character Display
