What is the "camera looking object" and two rectangular objects on my Nintendo Switch?
According to this graph from Nintendo on the parts of the Switch: 
The two little rectangles on the bottom left and right hand corner are speakers, and the little lens-like piece in the middle of the Switch is the brightness detector, which lowers the brightness of the screen depending on the detected light in the area.
The camera looking object is a brightness sensor, and the two rectangular objects are speakers.
Source is from Nintendo's website.
