Xiaomi InkPalm 5 Mini e-reader
The InkPalm 5 e-Reader packs a 5.2-inch screen with a resolution of 1280 x 720 pixels and a pixel density of 284 ppi. The device weighs just 115 grams and is as thin as 6.9mm. It is very convenient to carry and can be easily fit your pocket.
The InkPalm 5 e-Reader employs an 5.2 inch E INK Carta HD e-paper screen that is flush with the bezel, with a layer of glass. It has a resolution of 1280 x 720 pixels and 284 PPI. It has 24 white and amber LED lights, so you can read during the night or low light environments. It only weighs 115 grams and very convenient to carry and can be easily fit your pocket. This is the smallest e-reader that is currently available and more modern than the Kobo Mini.
In terms of the operating system, it runs on Android 8.1 OS and comes integrated with five major bookstores of Jingdong Reading, Variety Reading, WeChat Reading, Kindle Reading, and Handy Reading. It has the ability to sideload apps and ebooks.
Underneath the hood is a quad-core processor, 1GB of RAM and 32GB of internal storage. There is a USB-C port for transferring data and charging the Mini, it is powered by a 1,500 mAH battery. Other features include support for dual-band WiFi, Bluetooth 5.0, and power and volume buttons on the side, the volume keys can be used as page turn buttons for ebooks.
There is a great tutorial online that teaches you how to switch the default language to English and how to sideload in apps, and disable some of the pre-installed apps. You can read more about it HERE.