Because Numark Cue is discontinued, Numark now bundles or Serato DJ Pro with their hardware. If you have a Numark controller (like the Mixtrack or Party Mix series), you usually do not need a serial number for the "Lite" version—it is plug-and-play.
: Some "LE" (Limited Edition) versions use a license key printed on a sticker on the underside of the controller 3. Support & Updates Legacy Software
Finding and using your Numark Cue serial number depends on whether you are looking for the hardware identifier to register your device or the software license key for activation. 1. Locating Your Serial Number