how to install google play?

I just bought a headunit from aliexpress and, google play store is not installed, how do I installed it?


Model Number: rkpx3
Android version: 4.4.4
Kernel version: 3.0.36+
Build Number:
Android- eng.dufeng.20160266.091250
System: RK1_V01_C00_B01_2016-03-03

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