Yes, Redmi Note 6 Pro has a dual camera on both sides of the phone. At the front, you will get 20MP + 2MP dual front camera and at the back, there is a 12MP + 5MP dual rear camera.
Yes, Redmi Note 6 Pro does have the OTG support.
Redmi Note 6 Pro has a MicroUSB port.
Redmi Note 6 Pro comes with Android 8.1 Oreo version. However, it is expected that soon, the latest version of Android will be available via OTA update.
Yes, Redmi Note 6 Pro does have a 3.5 mm headphone jack.
The Redmi Note 6 Pro has it all - great display, snappy performance, no-nonsense features, excellent battery life, and very good and hassle-free camera experience. And all this is available at an amazingly low price.