The CPR All IN ONE Call Blocker is easy to set up and easy to use. You decide who you want to speak to. The CPR ALL IN ONE is the only Call Blocking product to have its own its built in 39Rogue Calling numbers list39 supplied by the Call Prevention Registry which prevents silent calls, robo calls, recorded messages, overseas call centres, harassment calls, malicious calls, junk faxes and withheld numbers. Companies which are selling by phone, using overseas call centres and automated sales lists are all pre programmed which will minimize the sales calls you receive almost immediately. The All IN ONE works on any home phone line, even with additional handsets and broadband.The lsquoBlock Nowrsquo button is located on the top of the unit. At the touch of this button the unwanted callerrsquos number is logged into the unitrsquos memory, hang up the call and the number is blocked permanently. Use this feature to block unwanted callers as they are calling you.The anonymous caller reject feature will reject any caller who withholds their number.The CPR All IN ONE Call Blocker Easy to set up and use, you decide who you want to speak to. The CPR ALL IN ONE is the only Call Blocking product to have its own its built in 39Rogue Calling numbers list39 supplied by the Call Prevention Registry It stops the following Silent Calls Robo Calls Recorded Messages Overseas Call Centres Harassment calls Malicious Calls Junk Faxes Withheld numbers The All IN ONE works on any home phone line, even with additional handsets and broadband.