It is hashes per item delivered AND power consumption per item delivered. Exactly as advertised.
Please link to the advertisement as well as state these numbers here + on the bet. There are several advertisements out there that are at least partly conflicting which leads to confusion as you can clearly see. Time to clear this up.
4.5 GH / 4.5 W
60 GH / 60 W
1.5 TH / 1.5 kW.
Wow, that is pretty damn clear.