Front View
Each device has a display and different keys (some of which have LEDs). A device can only be operated using the keys.
Keys and LEDs on the basic unit
1.Casing LED
2.Function keys (3x on each side)
3.Dedicated function keys
4.OK
5.Directional pad (Up, Down, Right, Left)
6.Back
7.Home
8.Clear
9.Keypad
10.Soft keys: situation-dependent function keys below the display (4x)
aMicrophone
bHold
cTransfer
dPlus
eHeadset
fLoudspeaker
gMinus
hRedial list
iMessage
Keys and LEDs on the key extension module
aFunction keys (10x on each side)
bControl rocker