Landline Phone Accessories -Call Blocker for Telephone with Line Portable Head Connector Caller Display 1500 Number Capacity Block all Nuisance Calls Strengths generic brand Call Blocker for Telephone with Line Portable Head Connector Caller Display Caller 1500 Number Capacity Block All Nuisance Calls Description: This is the latest version of phone call blocker with hidden or unavailable caller numbers that can be blocked. And there's no charge to use it; The manual has also been updated to an improved manual with better directed English. Block up to 1,500 individual phone numbers (including incoming and outgoing calls), prefixes and up to 10 area codes. One-key blacklist function; very easy to use even without a manual; Better to set the call blocker online (connected directly to the phone, then to the phone line); Although it can also be configured in parallel with the telephone to work, some telephone systems do not work. Permanent storage of blacklisted numbers even if the power is turned off or the telephone line is disconnected. It has a 3-line LCD display, with an obvious "Blacklist" button. specification: Blocks up to 1,500 phone numbers in the BLACKLIST; One-key BLACKLIST operation; Block entire area codes (up to 10); Block calls without caller ID (shown as UNKNOWN, OUT OF AREA, PRIVATE, etc.); Block up to 1,500 outgoing phone numbers, prefixes or area codes; Stores the last 100 incoming numbers and 50 outgoing numbers; LCD display with 4 brightness levels; Line-powered (no batteries or external power required); Compatible with FSK/DTMF and PSTN landlines NOTE CALLER ID SERVICE IS REQUIRED FOR THIS PRODUCT TO WORK. Block area codes, country codes, international calls, private calls, unavailable calls. Package Include: 1x Call Blocker 1x Cable 1x Line Connector 1x English User Manual Note: It can work with almost all single line phones, but not for VOIP phone, dual line phone, Bright House phones and AT&T phones; If you found some numbers are blocked but you don't want it, please check your blacklist and delete the numbers that like area or prefix numbers, because they are same