infinix Note 4 Pro X572 is a pro version of Infinix Note 4 that was launched in Nigeria, both phones have very similar specifications in the main aspects, but it is only the Pro version that got the pen (X-Pen ).

SOURCE http://www.skilhubmdc.com/2017/11/17/infinix-note-4-pro-review-spec-and-price/

Another difference between the duo can be found in RAM and the internal storage aspect where Note 4 uses a smaller ROM and RAM than its original counterpart, take a quick look through the key specifications of the Note. 4 Pro.
Features of the Infinix Note 4 Pro

SOURCE http://www.skilhubmdc.com/2017/11/17/infinix-note-4-pro-review-spec-and-price/

OS: XOS (Android 7.0)
SIM type: (Micro) Dual SIM
4G LTE: YES
Screen size: 5.7 inches FHD IPS Touchscreen
Screen resolution: 1080×1920 pixels
Processor Type: Octa-Core CPU, MediaTek MT6753 chipset
RAM: 3 GB
Internal storage: 32 GB.
Rear camera: 13MP camera and dual LED flash Light
Front camera: 8MP
Biometrics: Front-mounted fingerprint scanner
Battery: 4500mAh Non-Removable

Infinix Note 4 Pro has a 5.7-inch screen, the device would have a screen without glasses, just like what we saw in recent Samsung phones. Note 4 and Note 4 pro both use the same display resolution as that set at 1920 by 1080 pixels, which gives us a full HD screen.

SOURCE http://www.skilhubmdc.com/2017/11/17/infinix-note-4-pro-review-spec-and-price/

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Infinix Note 4 Pro price in Nigeria

https://www.phoneprice.com.ng/infinix-note-4-pro-57inchesltpsipslcdscreen/