In addition to appearance, the new model Xiaomi Redmi 4 has undergone several other changes. Among them:
- increasing the display resolution to the format Full HD (1920×1080);
- improving the operating system;
- increased memory capacity;
- adding new camera options (LED-flashes, phase-detection autofocus systems);
- expanding the list of sensors.
Technical improvements
On the same 5-inch screen, but with an increased level of resolution, the picture became clearer. The contrast has increased. There are 3 presets of color rendering (standard, colder, warmer), but the new version provides brightness control.
In terms of hardware, in addition to the usual Redmi 3S 8-core Snapdragon 430 processor, the 'Redmi 4' does not come with a regular Android 6.0 (Marshmallow), but an 'operating system' with a proprietary shell MIUI 8. It made it possible to stabilize the performance of all components of the smartphone with less energy consumption. The new skin has changed the icon design, set of sounds and animations of the standard Android, and also added hundreds of colorful themes.
Unlike its predecessor, modification Xiaomi Redmi 4 has an increased amount of operating and internal memory (up to 3 and 32 GB, respectively). Such indicators on the market are found only in premium models, for which higher prices are inherent.
The level of photography remained high. However, thanks to the presence of a proprietary shell, using the camera now allows you to more accurately adjust contrast, illumination and exposure, as well as choose the right filter. A small bonus of version Redmi 4 – the ability to edit images directly from the gallery.
The list of sensors has been replenished with a light sensor and an IR port.
On the Digital website https://y.ua/mobilnye-telefony-i-smartfony/xiaomi/ there are characteristics of other smartphone models Xiaomi with a full description of the modifications. 
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Comparison of Xiaomi Redmi 4 with analog
The 'Redmi 4' model is distinguished by the best parameters in comparison with similar phones from other manufacturers. Let's take the popular Meizu U10 as an example.
Key positive differences between Xiaomi and Meizu:
- format support Full HD;
- the use of a more productive and less power-consuming Snapdragon 430 processor;
- the best video core Adreno 505;
- addition of the camera with an optical stabilization function;
- battery capacity increased by almost 1.5 times.
As a result, the leader is obvious. Xiaomi Redmi 4 is a functional, competitive and affordable smartphone from a brand with a worldwide reputation.