Panasonic Cordless Telephone Handset pairs with the Panasonic KXTGD66x series of phones to expand your home system to up to 6 handsets total sold separately. Enjoy the exceptional call clarity and reliability of a landline with easytouse features that make your home and work from home life easier. Link2Cell allows you to make and receive your cell phone calls on the handset unit when mobile device is paired via Bluetooth to the base unit. And no need to worry about draining the battery on your handset an audible Low Battery Alert lets you know when the battery needs charging and more. Noise Reduction Technology helps make every call as clear as possible by reducing the surrounding noise coming from the other party s telephone. A robust Call Block system allows 1step blocking with the touch of a button on the handset device. Full duplex speakerphone lets you use your handset handsfree. Bilingual Caller ID lets you customize your caller ID to display in English or Spanish and get caller announcements in that same language so you can hear who is calling even when you re across the room note: caller ID requires additional service through your local phone company.