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Very handy device. Easy to use and gets it's power from the phone line. You will need caller ID for it to work. Just press the small black button on an incoming call to bloc that number in future. If you wish to block a know nuisance number you can also add the number by the use of the keypad on your phone. The unit has 2 pairs of telephone sockets which will cope with most telephone systems. All in all, a very handy and reliable unit.
Verified purchase: No
Item requires numbers to be accepted to be programmed. Blocks all others
Verified purchase: Yes | Condition: New