Display: The Note 4 has 5.5" 2.5D arc screen (1920x1080). This means that the Note 4 has a clean curvy look. The arced screen leads right off to the edge of the phone.
System: The Note 4 is powered by MIUI 8 (Base on Android 6.0 OS) and runs on the Snapdragon 625 octa-core 2.0GHz processor. This is a heck of a budget phone considering the hardware. With 3GB RAM/32GB ROM and 4GB RAM/64GB ROM, the Note 4 competes with many other more expensive models.
Camera: The camera setup on the Note 4 is something worth looking at. The front of the phone has a 5.0MP camera and the back has a 13.0MP Camera.
Other features: Some other features include Dual SIM capabilities, 4G LTE, WIFI, Bluetooth, GPS location, etc. The Note 4 is just another great example of what you can buy on a budget. (For a more detailed look at the Redmi Note 4 see "Specifications")
2G: GSM B5/B8/B3/B2 3G: WCDMA B1/B2/B5/B8
4G: FDD-LTE:B1/B3/B4/B5/B7/B8/B20, TDD-LTE B38/40