TelPal Call Blocker Display for Landline Phone with 1500 Number Capacity Block Robocalls , Telemarketing Calls, Junk Faxes and All Spam Calls This Call Blocker can avoid disturbing & malicious calls by one-key-setting, and it can help you to get rid of them forever. It can also avoid the waste on Paper by unnecessary faxes if you connect it with the fax machines. Blocks up to 1500 Phone Numbers in Blacklist(from 3 to 16 digits), Block up to 1,500 outgoing phone numbers, prefixes or area codes. Hidden numbers can be blocked too. One-Touch BLACKLIST Operation, Line-Powered (no external power or batteries needed), 4 Brightness Levels, Stores the most recent 100 incoming and 50 outgoing numbers. Easy to Setup & Use -- Simply press a button to BLACKLIST numbers forever! Factory direct supply: fast delivery and full professional technical service supported Attention: Not Compatible with Cordless Phones & Two Line Phone systems, especially AT&T Phones !!