Panasonic kx-tgc253b dect 6.0 cordless phone system w/ call block & silent mode panasonic continues to evolve their technologies to make things better - at home, at work, at play and on the go with their line of dect 6.0 plus telephones. each model carriers with it the same features and reliability you've come to expect from the panasonic brand, but with improvements that make seeing, hearing and operating you phone simple so keeping in touch with family and friends is easier.