* 4.3" full color display
* AC plug-in
* Rechargeable batteries
* 24 hr battery back-up
* User programming
* User function
* Night light
* Sleep mode
* Proximity arm/disarm (WTK5504P only)
* Voice chime/voice prompts
* Wall and desk stand mount
* Multi-language support
* 3-5 year battery life
* Tamper switch
* Compatible with IMPASSA, ALEXOR and PowerSeries (via TR5164)
* 5 programmable function keys
* 3 emergency keys