How can I tell the diff. between the 6101 & 6100

It will say on the box. The pumps look identical but a 6101 lacks a driver box and uses a laptop type power supply instead of a torroidal transformer.
 
I guess I did not mention I'm buying a used one, I'm not sure he still have the box, but if he doesn't have how can you tell just by looking at the pump?
 
The 6101 has only been available for 2 months, the 6101 has a sticker on the pump that says 6101, the 6100 will say 6100.10.
 
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