DECT 6.0 Technology CallerID/Call Waiting Blue Backlit Keypad and Display Sleek Thin Design Handset Speakerphone Expandable up to 5 Handsets - using the rz6030 Accessory Handset Voicmail waiting indicator Transfer Calls Between Handsets Conference an outside call Between Handsets 50 Name/Number Phonebook Directory Headset Compatible (2.5mm) WiFi Friendly - won't interfare with wireless networks Page/Handset Locator.