Amazon.com : Panasonic Cordless Phone Handset Accessory Compatible with KX-TGF97x Series Cordless Phone Systems - KX-TGFA97S : Office Products
Panasonic KXTGFA97S KX-TGFA97 Additional Expansion Handset Phone for KX-TG994 SK | eBay
Panasonic - Parts and Accessories - Cordless telephone handset Guide. - Use this guide to look up handsets compatible to your telephone and where to purchase.
Base Unit, Power Supply, Two Phones Panasonic KX-TG994SK KX-TGF970 FOR KX- TGFA97 | eBay