We offer a Two Year Warranty with an exclusive no-questions-asked return policy for the ultimate peace of mind! New-and-improved V2.2 eliminates the problems of prior versions and is only available from seller "ProCallBlockDotCom." * Simple, one-touch programming makes annoying phone calls a thing of the past. Can also be easily programmed to block "UNKNOWN," "PRIVATE," and/or "OUT OF AREA" calls. * No batteries required! Units run on the power from the phone line. Stored numbers are saved even when power is lost unlike previous versions. * ***Please note: Units purchased from sellers other than seller "ProCallBlock" in this listing are ineligible for warranty coverage by ProCallBlock. Please make sure you are purchasing from seller "ProCallBlock" during checkout. Also please beware of good-intentioned reviewers reviewing previous versions of the product in what should be the V2.2-exclusive review section. We are eager to hear what you have to say about our product, but please make sure the product you"re reviewing is a Genuine V2.2 from seller "ProCallBlock." Thank you!*** * Blocks up to 1,500 unwanted phone calls. Works with land lines, VoIP, and DSL services. If you have a non-conventional "Digital Voice" service, please email us to check if it will work with your particular phone company. There are known issues with certain digital voice plans, and these are the #1 cause of returns that could have easily been prevented. Thank you! ***UPDATE...unit will NOT work with newest Comcast XFINITY equipment. It will work with older non-XFINITY phone systems from Comcast, however.***