Numark.com Register [extra Quality] -

Do not include the "(21)" prefix often found on the sticker; just enter the characters that follow.

Here’s a concise review of the (used for warranty, software, and support): numark.com register

Go to Numark.com and click on the "Account" button at the top-right of the page. Do not include the "(21)" prefix often found

: Serial numbers often use the number "0" rather than the letter "O." numark.com register