The serial number is a unique code (usually 10–12 digits, sometimes starting with ST or a similar prefix). You can find it in several places:

An 11-digit number used for subscription renewals. On older models, this is on the physical card; on newer cardless models, it is on the same bottom sticker as the S/N. Decoder Serial Number (S/N): The 17-digit identification number for the hardware itself.

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