The Iris devices are hit or miss with Z-Wave so be careful. There are outlets who have updated firmware that work just fine. Unfortunately there is no way to update the ones who don't have it. As far as being able to tell - there is no hard and fast rule. It's possible that if you have a small bar code sticker on the back then it MIGHT have the updated firmware and will be okay..
Also check here :
Credit for this goes to @ogiewon
