The call block device has a 2000 number blocking acity. Completely keeping your phone quite without annoying call. | The phone number blocker can block international area codes, it's useful for those international aggravating calls that deceptively adopt your area code and any exce. | One-touch blacklist function, super easy to operate even without manual. | The phone call blocker is the greatest invention to enhance the privacy of your home phones. Say goodbye to all annoying voice-mails. | With just 6 buttons on the blocker and clear LCD screen, friendly for older people as well. A great choice for Christmas gift.