CPR V202 Call Blocker - Block All Robocalls, Political Calls, Scam Calls, Telemarketing Calls, Unwanted Calls On Landline Phones. Block All Nuisance Calls At The Touch Of A Button Using Caller Id The Worlds #1 Call Blocker Is Small, Discrete and Boasts a 3" Caller Display Screen Only One Call Blocker Needed Per line - Lifetime Telephone Support Included Block unwanted callers at the touch of a button with the large "Block Now" button or by entering #2 on Cordless extension handsets 1200 Number Capacity - Line-powered (no external power or batteries needed) Block Area Codes, Country Codes, International Calls, Private Calls, Unavailable Calls, Unknown Calls NOTE **CALLER ID SERVICE IS REQUIRED FOR THIS PRODUCT TO WORK**