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of transmission over the air. The receiving radio can use the extra parity bits, and it mathematically figures out what's missing from the voice data, and it can reconstruct the audio that's missing seamlessly. Now, these systems used to be an arm and a leg, because processors were very expensive to put in. Now, with arm architecture, processors are powerful. They're fast and they're very cheap. So, all this stuff that was hard, almost impossible in the 80s, difficult in the 90s, is super easy today, which is why we see a proliferation of these digital voice modes versus earlier in time. So, where does this error correction happen? Well, the encoding and decoding, it actually happens entirely inside the subscriber unit, so this is the handheld mobile radio, or the mobile radio, or the handheld radio. So, it's all, that's the industry's way of saying it all happens within the radio itself. The other place it can also happen is at the...