Hardware vendor and serial numbers with WMI

HW model/vendor :

Get-WmiObject -Class 'Win32_ComputerSystem' | select Manufacturer,Model

Manufacturer : Hewlett-Packard
Model : HP EliteBook 820 G2

Serial Number :

Get-WMIObject –Class 'Win32_BIOS' | Select SerialNumber

SerialNumber : 5CGxxxxx