The pictures of the top and bottom PCB of the Cheerson CX-10A is from a blog post on Adafruit.com.
https://blog.adafruit.com/2015/03/23/mini-quadcopter-internals-droneday/ I decided to buy a few of these quad-copters from Amazon.
I found that they are a number of versions of these quad-copters with different color PCBs.
I also received a blue version which contains an STM32 Cortex M0 microcontroller, a motion-processing unit from Invensense and a wireless chip from Pantek. Some versions include the Nordic chipset.
There are JTAG test-points provided to allow debugging of the ARM Cortex M0 MCU.
The CX-10A quadcopter has a 100mAH battery that allows for up to 10 minutes of flight time.