Mute Answer Any key Last 10 number redial Voicemail waiting indicator Quick access key for voicemail box English/Spanish/French setup menu Adjust the volume up or down to best suit your needs Accessory handset only—requires a CL82115, CL82215, CL82315, CL82415, CL82465, CL82515, CL83215, CL83315, CL83365, CL83415, CL83465, CL83565, CL84115, CL84215, CL84265, or CL84365 to operate Enlarged font and extra large, backlit keys make the keypad easy to use. This feature is especially helpful for those who are visually impaired. ECO mode manages power consumption so the system uses less energy and you get the best battery life. Silence the ringer on the handset and base for just a moment or for an extended period of time. Input and/or save up to 20 names and numbers in the call block directory to stop unwanted calls from ringing through Caller ID subscription Required . AT T DECT 6.0 products provide unsurpassed range and clarity thanks to a unique antenna design and noise filtering technology. This means phones that perform 45 percent better than the competition in lab tests—and the confidence you can take a call in the intercom between handsets Conference between an outside line and up to 4 cordless handsets Program up to 50 names and associated phone numbers in the handset. Quickly access the directory entries by scrolling alphabetically or by entering the first letter of a name