How can I tell the difference between a v1.0 and a v1.1 adapter?

On the sticker located on the rear of the packaging, you will find that the v1.1 adapters have v1.1 in the description. The part number also differs.
If you don’t have the packaging, you can tell the v1.1 adapters by looking at the side of the adapter, and locating the stabilization pins which are visible on the side of the PCB. v1.0 adapters do not have these stabilization pins: