You can find a Mac's serial number through the About This Mac menu, by locating the number on the physical device, or online.
You can find your Apple Watch serial number using your Apple Watch or its paired iPhone. Here's how to do it.
Department of Electronic Engineering, Chang Gung University, Guishan Dist., 33302 Taoyuan, Taiwan Artificial Intelligence Research Center, Chang Gung University, Guishan Dist., 33302 Taoyuan, Taiwan ...