On my device
Find the serial number, EMC number and model number printed on the underside of your Mac near the regulatory
markings. It's also on the original packaging next to a barcode label. EMC is the
most accurate number to compare with our list as it takes into account the year of your device.
The original packaging might also show an Apple part number such as MNYF2xx/A ("xx/A" is a variable
that differs by country or region and is not included on our list so can be disregarded)."
Use System Information
Go to Apple icon > About this Mac > System Report. It will automatically be selected on the hardware
tab (left side). To the right, the model name and model identifier will be written on the first two lines."