Smart call blocker lets you block nuisance callers on the spot with one touch. It can filter robocalls and unwanted calls while allowing welcome calls to get through. Digitally record up to 22 minutes of incoming messages, outgoing announcements, and memos. Easy to use with talking digits The large orange lighted display is designed for easy reading even in darker places. The buttons are generous in size measured to 15 x 12 mm, designed to help the elderly dial out the correct number. Instantly boost up the volume The Audio Assist feature temporarily increases overall volume by up to 50dB. it is easy to use, just one press on the button on the right side of the cordless handset. Press again to turn off. Ringer level from 5 to ringer off The extra-loud ranger makes it easier to hear incoming calls throughout your home. Simply press Menu / Ringers/Handset or Base - Ringe Volume/ Select. Volume easily controlled The volume control is using an Audio Assist/SOS button on the cordless handset can function as an emergency button. The system supports up to 30 total devices.