Is my Dyson an ERP or Non-ERP version?

This question I one of the most popular Dyson questions we receive here.

There is a quick way to find out if your machine is an ERP version or a non-ERP version and that is by looking at the floor head.

If you do have a red slider then you have an ERP version

If you do not have a red slider then you have a non-ERP version

The above image is an ERP version head.