The 7 19 of Kuaiyidian has just come into the market, and the quality is still unclear. I suggest you ask your classmates before buying. . . .
As for slim's r86, it is known to be the most powerful Russian-Chinese electronic dictionary in China. Apart from all the functions of r850, it is the only one that can translate Russian-Chinese whole sentences, and it is also the only one that can be input by handwriting through the keyboard (supporting all languages and characters in Europe). . . Still a color screen! In addition, multimedia is also very powerful. Imagine reading a foreign language book while playing mp3 and mp4. . . . What a pleasant enjoyment!