LeeKer LK-P06B Phone Call Blocker Blacklist Caller ID Display Box Dual Signal FSK/DTMF No More Nuisance Calls(Black) Great Relief from Unwanted Callers; Getting Quiet and Giving us Back OUR Phone Programmable functions can be turned on or off including withheld blocking function, international blocking function, unavailable blocking function, VOIP blocking function, last calling number blocker, area code blocker and PPI calls blocker Easy to set up and works with any home phone line, even if you have additional handsets or have a broadband connection; Block up to 1,000 unwanted phone numbers; Block up to 5 area codes or prefixes (1-5 digits); Block anonymous & withheld numbers Blue backlight & 4 levels of brightness; Stores phone numbers in non-volatile memory(retains stored data if loses power) Stores up to 100 incoming and 50 outgoing calls memory; Visual incoming call alert LED light; Desktop or wall mountable