KX-TGA710B Panasonic Call Block Button with Bilingual Talking Caller ID NEWBRAND NEW KX TGA710B Panasonic Call Block Button with Bilingual Talking Caller ID Push a Button. Block Robocalls Automatically. Instantly stop robocallers and other unknown numbers with Panasonic's KX TGA710 Call Block Button. A quick connection to your landline phone lets you block 16,000 numbers. An included 14,000 number database* gets you started, and you can block 2,000 more numbers manually with the push of a big red button. Landline Phone