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Block all unwanted calls from telemarketers, credit card companies, collection calls,political calls ,prank calls,unknown callers calls and nuisance calls with the Latest PRO CALL BLOCKER VERSION 4. Block upto 1000 unwanted /BLACKLIST calls with 8-16 digits.Review last 100 Incoming calls on a JUMBO DISPLAY with BLUE BACK LIGHT. LCD will display the phone number(upto 16 digit) with date and time of each call. Review last 50 OUTGOING Calls.LED for all the INCOMING CALLS. Security PIN for adding/removing any number to the blacklist.Each CALL BLOCKER UNIT comes with Manual Instructions, Power Adaptor & Telephone Wire. *Batteries not included.