Pro Call Blocker Newest Version 2.2! Nuisance phone call block and telemarketer screener. One-touch programming, TWO YEAR WARRANTY includes accidental damage protection! Simple, one-touch programming to block annoying phone calls FOREVER Blocks up to 1,500 unwanted phone calls, and 10 area codes. Works with land lines, VoIP, DSL services, and digital voice services No batteries required. This device runs on the power from the phone line