This is a calculator that was designed for China. Based in the same hardware-software platform as the HP Prime, and running the same HPBasic language (albeit with some less functions), this is a very powerful calculator. The main differences firmware-wise with the HP Prime is its lack of PRN entry method, and the lack of CAS. In the hardware side, it has very sharp screen with 16 grey levels, and a set of batteries run on parallel: yes, you can even run it with a single battery, but it won't last long that way!
And, at the special price of 50€ during Black Friday, it is a fantastic opportunity for a collector that wants to have the complete HP set.