Redmi 3S Prime is its large 4100mAh battery. There’s a 13-megapixel rear camera with features like PDAF ( phase detection autofocus) , f/2.0 aperture, HDR mode, 1080p video recording, and an LED flash. You also get a 5-megapixel front-facing camera which supports 1080p video recording.
The device runs MIUI 7.5 which is based on Android 6.0.1 Marshmallow. The skin is a slightly updated version of what came with the Redmi Note 3. Unfortunately, you won’t see many Marshmallow features such as Now on Tap. The company is expected to roll these features out in the next MIUI release.