The firmware is the software running on the devices, may it be a lamp or a smartplug.

The firmware controls certain functions of the product as well as run features triggered by a command in the app, the cloud, an automation, or the press of an accessory button.

We update the firmware of products regularly in order to match with releases of new functionalities or to provide security fixes, as well as resolve bugs we have identified and improve existing features.

You can see the firmware version on the Settings page of products which can be updated. This can be found in Product->Settings->Device info and scroll down that page.

Note that accessories for the most part do not support update of their firmware, and therefore version may not be listed in the application.