The KX-TG6821 convinces with its large, white-lit graphic display for very good legibility and first-class user-friendliness. The illuminated NR(Smart) button brings smartes additional skill. It flashes when calls are received or missed or new messages are received on the AB. One press is all it takes to accept calls with the hands-free function already activated or to silence the integrated alarm clock for another five minutes. 30 minutes of recording time is provided by the integrated, extended answering machine. If telephone numbers or addresses have been left behind, the new forward and rewind within a message is helpful. However, the KX-TG6821 can also call a previously stored phone number and play the message when new messages are received. Thanks to night mode and caller lock, you can determine when you are available for whom. The call costs - especially for expensive service numbers - are also reliably under control via dial control. The KX-TG6821 also has a hands-free function, a large selection of polyphonic ringing melodies and a phone book for up to 120 entries and 50 in the caller list. Noise reduction can be easily activated during a call by pressing the NR (Noise Reduction) button and filters out disturbing noises that occur in the background of the call partner. Outstanding voice quality through Clear Sound technology: Optimized transmission algorithms ensure crystal-clear voice transmission - even in borderline areas.