Panasonic KX-TGA 682 Additional Handset Please note that this is an additional handset and charging cradle to be purchased for use with an existing system. This handset cannot be plugged into a telephone line, and will not work without a base station. This is the correct handset for use with the Panasonic KX-TG6821 Cordless Phone: a premium budget Cordless Phone. The KX-TGA682 handset boasts a 1.bright. high contrast LCD display,which is easy to read and one-touch noise reduction key for better sound. Up to 6 handsets can registered to the base of the Panasonic 682 range. Benefits of using multiple handsets include features such as: intercom, call transfer, conference calls, and phonebook transfer. Setting up the KXTGA682 Additional Handset is simple and straightforward.