looks like a US plug tucked away there at the side...why do we need an extra usa adapter for $1 usd then?
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its a good question. I actually beleive that you do not need the adapter. look at it:
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It looks like it adds a grounding pin, but otherwise serves no purpose (that grounding effect wont transfer to the R1 AFAIK)
Is it just me?
That plug does not look like it fits that adaptor.
It looks like the 2 pins on the R1 flip out (like a lot of wall-wart devices do) and completely compatible with the typical 2-pronged (L,N) 110-120V sockets in North America.
The adapter looks to simply convert that to include a grounding pin as per 3-pin (L,N,G) outlets. Only reason you would otherwise use it is if it features a 115->230V converter (which i doubt)
I wouldn't bet on it being the US standard. The picture posted shows them folded in and from a bad angle. Chinese Standard prongs are similar to US, they are just angled inwards. Another possibility is that they sent the reviewer a developer unit.
If they are selling the R1 with a US adapter, odds are you will need it.