Can you help me?

I need a little help with buying a computer case. I was wondering that if it writes: nWin EA001 ATX TOWER BLACK 400W,. Does that mean it comes with 400W PSU?

I think it means that it doesn't come with a power supply but you can put in it up to 400W.

I think it means that it doesn't come with a power supply but you can put in it up to 400W.

spy2828