Caller ID with Phone Ring Control, A Computer to Stop Unwanted Calls and a Completed IT System to Control Phone Ring Keep tracking 100 numbers as normal Caller ID, and able to stop unwanted phone Ring. Store up to 270 phone numbers and names in 3 level (A-Important, B-Normal, and R-Reject). A mini Computer to Block unwanted calls. Phone will ring only to who you want talk to. Hour by hour control, group B- which is callers you only want to talk to at certain times. Four line LCD with Backlight, your personal phone book directly connect to your phone.