CPR V100K Call Blocker for Landline Phones - Block Unwanted Calls with One Touch Big Red Button - Pre-Loaded with 100,000 Known Nuisance Numbers - Requires Caller ID

COMPATIBILITY: Works with most traditional analog landline phones and services from providers such as AT&T, Verizon, Frontier, CenturyLink, and Brightspeed. It is not compatible with internet-based or digital phone services (VoIP), including Vonage, Ooma, Xfinity Voice, and Quantum Fiber. CALLER ID REQUIRED: This unit needs Caller ID service to identify incoming numbers. Without this service, calls cannot be blocked automatically. No external power supply is necessary - just plug it into your phone line and begin using it. EASY MANUAL BLOCKING: Comes preloaded with 100,000 known nuisance numbers and enables instant blocking of new or repeat numbers using the large BLOCK NOW button. You can add up to 10,000 extra numbers, providing you control over unwanted calls. REALISTIC CALL PREVENTION: While no device can stop 100% of spam or spoofed numbers, this device assists in shutting down repeat offenders swiftly and offers you more control than passive filters alone. SIMPLE DESIGN: No power supply, app, or subscriptions are needed. Clear display, tactile button, and straightforward installation make it simple for seniors or anyone to use. For additional protection, pair it with your phone providers spam filtering service