- Panasonic expandable digital cordless system
- Answering system
- DECT 6.0 Plus technology
- Choice mail
- Icon operation
- Large white backlit 2.1" handset LCD
- Talking caller ID
- Large text display mode (multi items/single item)
- Intelligent eco mode
- Non-clip handset design
- Call block
- Silent mode
- Expandable up to 6 handsets
- All digital answering system
- Ringer ID
- Up to 4 way conference capability
- Additional handset: KX-TGA651B


(Replacement, the KX-TG4021N or 7531B). Please review those items, since KX-TG6531B is discontinued