usually its on the label of the device with something like v2 or r2 after the model number

(version 2 or revision 2)

All if the ones I've seen doesn't state such, although I do see hardware as V1.0. The company stated the Docsis 3.1 means it's version 2 and Docsis 3.0 would mean Version 1. I purchased it, I hope they didn't give me bad information and after the return period is over I find out mine isn't the new model.