Product type	Where to look
Heating, Cooling & Air	Thermostats show the model on the back of the faceplate or in the settings menu. Window units put the label on the side of the cabinet. Purifiers and dehumidifiers put it on the base or back.
Smart Home & Security	Check the back of the device or under the mounting plate. For many brands the app shows the exact model under device settings, which is handy once it is mounted.

Getting the official ecobee manual

ecobee publishes product documentation on support.ecobee.com. Search there with the full model number from the label, then look for a documents, manuals or downloads section on the product page.

If your model isn't listed, try removing the last few characters, which usually only indicate color or region. For discontinued models, look for an archive or legacy products section, or contact ecobee support directly.