Panasonic 6821 Long Range DECT Phone: Easy to Install and Use. The Panasonic KX-TG 6821 is a feature packed cordless phone with a large user-friendly 1.8-inch LCD display, and an integrated answering machine with message counter on the base. This long range set comes with a liGo DECT repeater, which is easy to install for increased coverage in your home.. Excellent sound quality with noise reduction. Enjoy your calls at home in exceptional clarity with the Panasonic KX-TG6821 thanks to a high-precision error correction system, and Panasonics Noise Reduction Technology. The handset features Panasonic's high-quality speakerphone with clear audio so you can leisurely chat away in hands-free mode without compromising on sound quality.. A phone you can rely on. The Panasonic 6821 can give you 15 hours of talk-time and up to 170 hours of standby time when fully charged making it an ideal choice whether you talk little and often or all the time. And when youre not available to answer, calle