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The oval is said to have been formed by the combination of dual LED flashlights we heard last year. Some people say that one is in a bluish tint and the other is normal. The purpose of this design is to optimize the white balance when taking pictures, but we can't distinguish between the two now. In addition, there are no other changes in the back of the iPhone 5S. 
(exposure iPhone 5S prototype) 
(Exposure of the iPhone 5S sketch)
Inside the device, its battery power specification is 5.95 watt hours, which is significantly larger than the 5.45 watt hour of the iPhone 5. From the photo point of view, its processor specifications are not indicated, we can not know whether it is a brand new A7 chip or other chips.
It is rumored that the iPhone 5S will be released with the cheap iPhone this fall. Both devices will feature a 4-inch screen with an iOS 7 system pre-installed. However, the cheap version of the iPhone may use a slightly thicker plastic case, and the high-priced iPhone 5S will use the same aluminum metal case as the current iPhone 5. 
iPhone 5S prototype exposure with dual LED flash
Recently, the iPhone 5S front panel and motherboard have been exposed. Now the foreign media has exposed two photos of the iPhone 5S prototype. The photos show that the components and wiring connections on the iPhone 5S motherboard are very similar to those of the previous exposure. The shape of the LED flash is the same as the iPhone 5S sketch that was exposed a few days ago.