The JUMBO Talking Caller ID SEE Who is Calling --- HEAR Who is Calling - NOW WITH CALL BLOCKING - NO MORE SPAM CALLS! ..Big Display see who is calling ..Talking Caller ID Name and Number hear who is calling ..Recordable Name customize the caller name ..Can Block all calls and White List 50 numbers ..AC Power Adapter Included ..Extra Jack and Cord for Telephone in the back of unit don't waste a phone jack ..Battery backup you can still use the unit if the power goes out for 3-4 days 4 X AAA ..Programming saved forever no worries about losing programming if power goes out even without batteries ..ALL PHONES BLOCKED blocking function controlling all the phones on that line without them changing any wiring in the house it will control any phone that is in parallel on that line .. 2 display languages, English, Spanish .. Support of 99 groups of called numbers. Phone Numbers can be found and can be called back .. 3 3/4” inches by 2” inches LCD BIG LCD display