COMPATIBILITY: For traditional analog landline phones and services from providers such as AT&T, Verizon, Frontier Communications, CenturyLink, and Brightspeed. NOT COMPATIBLE with internet-based or digital phone services (VoIP), including Vonage, Ooma, Xfinity Voice, and Quantum Fiber. IMPORTANT: The V100K CPR Call Blocker requires Caller ID service and an analog telephone line. Without Caller ID, incoming numbers cannot be identified or blocked. No mains power required - just plug it into your phone line and use. Powerful Blocking, Made Simple: Preloaded with 100,000 verified scam and nuisance numbers, the V100K starts protecting you right out of the box. And if a new or spoofed number gets through, the large “BLOCK NOW” button makes it easy to instantly block it - up to 10,000 additional numbers at your command. Realistic & Reliable Protection: While no device can stop 100% of spam (scammers constantly change numbers), the V100K gives you the power to shut down repeat offenders quickly and effectively - offering more control than passive filters alone. Hassle-Free Design: No power supply needed, no app, and no subscriptions. The V100K is easy to install, with a clear screen and loud button click for extra confidence. Designed with seniors in mind, it’s ready to use and simple to maintain. For even stronger protection, you can pair it with your phone provider’s spam filtering service. Peace of Mind Guaranteed: Every unit includes a 3-year manufacturer warranty and lifetime customer support. Our friendly team is just a message away - contact details are included in the box for personalized assistance whenever you need it. Call Blocker for Landline Phones - Say no more to robocalls, spoof calls,political calls, scam calls, unwanted calls, nuisance calls, telemarketing calls: block all at the touch of a button! The CPR V100K Call Blocker features a 3 inch caller display screen, large "Block Now" Button, 110,000 Number capacity and has the ability to block unwanted callers from cordless DECT extension handsets by pressing #2. V100K Main Features: Easy to use controls: With CPR Call Blocker easy to use control buttons you can view the callers number on its large 3 inch display and view the blocked number list as well as see how many times that blocked number has tried to recall. If required blocked numbers can be easily removed from the block list using the delete button. Built in Number List: The CPR Call Blocker is pre-programmed with more than 100,000 numbers which are 'deemed' As known nuisance callers. Companies which are selling by phone, using overseas call centers and automated sales lists are all pre-programmed which will minimize the sales calls you receive almost immediately. Block Now function: The ‘Block Now’ button is located on the top of the unit. At the touch of a button the unwanted caller’s number is logged into the unit’s memory, the call will hang up and the number blocked Permanently. This feature allows you to block up to 10,000 unwanted callers as they are calling you. #2 Blocking function: Block a number by entering #2 on any DECT handset connected to the telephone base. Manual entry: Manually enter or remove numbers to/from the blocking list Compatibility: Compatible will all major US line providers including AT&T, Comcast, Coma, Verizon, Century Link, Frontier etc. Caller ID services from your network provider is required for this product to work.