The listing, NEW Extra Expansion Wireless Handset For Panasonic Cordless Telephone System - KXTGFA51B/KX-TGFA51 has ended.
This is a new but no box, KXTGFA51B KX-TGFA51 Link2Cell Additional Expansion Handset . It is compatible with: KX-TGF545B/TGF540/570/TG785 series. The phone can't work alone, it needs one of those base systems, it's an extra extension for them. I got this for about $32. You can only use 6 extensions on the system we have (I think it is KX-TGF545B) and this was the 7th one, so it would not register. There is nothing wrong with it and it will work great if you have one of the compatible systems.
This is a pretty cool system when you have the base answering machine. It uses bluetooth to pair with up to 2 cell phones and you can use Siri or Google Now from the cell phones, using one of the extensions with just one button push (2 or 3 if you've paired 2 cell phones...).
From Kmart description: "Panasonic additional DECT 6.0 Digital Cordless Handset compatible with TGF Series Cordless Telephones. Additional Handset Cordless Telephone Sync up to 2 smartphones to make and receive cell calls throughout the house via Bluetooth. Access the convenience of Siri, Google Now and S Voice from your handsets with one-touch Voice Assist. DECT 6.0 Plus technology for superior clarity and range. Amplified Handset Volume with Dedicated Volume Key. Enhanced noise reduction and tone equalizer.
Free US shipping.