Panasonic DECT 6.0+ cordless systemPower back-up operation Reversible handset designHands-free speakerphone on base unit and handsetMessage counterSmudge free designReversible handset design place the handset on the base unit both waysNonslip handset designEasy to see/ easy to use large backlitTalking caller IDCall block Silent modeExpandable up to 6 handsetsRinger ID 18 Minute all-digital answering systemHands-free speakerphone on handset and base unit4 Way conferencingIntercom between handsets or base unitShared phonebookHigh quality ringer 5-melody/5-tone on handsetLocator button to find misplaced handsetsHeadset jack on handsetBelt clip on handsetRechargeable AAA Ni-MH batteriesKXTG6633B