Display Tiltable graphical display, 6 lines monochrome, backlit Optical call alert Keys Keypad 8 fixed function keys (partly equipped with red LEDs) 6 freely programmable soft-labeled touch sensor keys with red LEDs Control keys +/- 5-way navigator Acoustics Hands free talking (full duplex) Interfaces Headset jack USB slave OpenStage Key Module Wall-mountable OpenScape / HiPath Support OpenStage T TDM phones can be used with: HiPath 3000, HiPath 4000, OpenScape Business X1/X3/X5/X8 Octopus F200/F400/F650 & Octopus F X3/X5/X8