It's the robocall blocker for landlines! Deluxe call blocker puts you back in control of your privacy with 5000 pre-programmed numbers of the most notorious telemarketers and spammers.If you get a nuisance call from a non-programmed number, just hit the big red “BLOCK NOW” button to end the call and add the number to the database – unit has room for you to add 1,500 additional phone numbers! Connects to any landline, features large 3" caller display screen, call list to display last 20 calls, and cordless/manual number-blocking options. 4 1/2" x 4" x 1 3/4"; includes connection cables.