How do you know you're buying the correct model of Antminer S9?

For instance, I'd like to buy this one: http://amzn.to/2k8PcmX

They say 14th/s, which seems to be the fastest model, but can you trust product descriptions?

Submitted November 28, 2017 at 09:01PM by loulan http://bit.ly/2BxcwiH