I have a nexus 7 and it toggles on or off by a magnet in the case.

http://www.youtube.com/watch?v=Kvvo34MGovk

http://www.youtube.com/watch?v=wx30f6XV-Bk

On Tue, 16 Oct 2012 22:46:37 -0400
gmail <[email protected]> wrote:

> I think it goes off of facial recognition; the inside of the case has
> a face detectable only by your N7.  When it sees it, it locks.
> On Oct 16, 2012 6:18 PM, "bob" <[email protected]> wrote:
> 
> > How does my Google Nexus know to lock its screen when I shut the
> > case?
> >
> >
> > It doesn't seem to be the light sensor.
> >
> >
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