DECT 6.0 digital technology provides the best sound quality, security, and range in cordless phones. HD Audio The frequency band has been extended allowing for the signal to be reproduced and tuned for a fuller and clearer sound. 50 name and number phonebook directory Easily store and dial your 50 most frequently called numbers. Compatible with hearing aids Telephones identified with this logo have reduced noise and interference when used with most t-coil equipped hearing Aids and cochlear implants.