I can't understand this circuit board

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Shauryafrom2006
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New user has been reminded to post much more information when asking for help at PF
TL;DR
I am unable to understand this circuit, help would be appreciated.
EC (4).jpg
EC (3).jpg
EC (2).jpg
EC (1).jpg
 
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Since you have posted no circuit diagram, just a pic of some components, no one here is going to be able to figure it out either. It's a bunch of components, not a circuit, as far as we can see.
 
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Some kind of cheap battery management and some kind of (likely cheap) LED control.
Can't even see the chip markings.
What's written on U1?
 
Welcome to PF.

Shauryafrom2006 said:
I am unable to understand this circuit, help would be appreciated.
What does it do, is it a motion sensing light, or a fire alarm ?
Why does it have a USB connector ?

The PR 9490 component in the middle of the PCB looks like an infrared detector.
Does it have a multi-facetted lens in the outer case that is not shown ?
 

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