** SMART CALL BLOCKER ** This system lets you block nuisance callers on the spot with one touch. You can permanently blacklist up to 1,000 numbers. What's more, it can filter robocalls and unwanted call while allowing welcome calls to get through. For screen out robocalls, set it to ask the callers to press the pound key. For screen out unknown callers, set it to ask the callers to record their names and press the pound key. After your caller completes the request, the phone rings and announces the caller's name. You then can choose to block or answer the call, or forward the call to the answering system.