Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Check out details

This product does what it claims, with one problem. Not only does it stop tele-marketers, it stops all calls that are from 800 numbers and those made using several phone cards, especially those purchased from Wal-Mart. If you don't get these calls, this product is for you. But, if you get important calls that are through 800 numbers or family and friends who use phone cards, then think first before getting this product. An answering maching is better.