The Xiaomi Redmi Note 9S shares a lot in common with the the Xiaomi Redmi Note 9 Pro. It is a sequel designed to meet the needs of enthusiasts who live outside India. Although they bear different monikers, you have got largely the same design and hardware.
As for the CPU, same Qualcomm Snapdragon 720 SoC is used, having 8-core CPUs clocked at 2.3GHz along with Adreno 618 GPU, 4/6GB RAM and 64/128GB internal storage, expandable up to 512GB via SD card.
The phone has a 5020mAh battery with 18W fast charger, and available in Aurora Blue, Glacier White and Interstellar Gray colors. There is a side mounted fingerprint scanner, and the latest Android 10 out of the box.
In Nigeria, the Xiaomi Redmi Note 9S price starts at around 82,500 Naira.