Automatically removes your phone number from telemarketers' lists. As seen on TV. The majority of telemarketing calls are dialed by computer. Now you can take control of your privacy and nearly eliminate disruptive computer dialed sales calls - with the TeleZapper from Privacy Technologies. When you or your answering machine picks up the phone, the TeleZapper emits a special tone that fools the computer into thinking your number is disconnected. Instead of connecting you to a salesperson, the computer drops the call and stores your number as disconnected in its database. As your number is eliminated from more and more list, those annoying computer-generated telemarketing calls just about stop altogether.