@chenliangchen I already have a Jolla tablet, and I'd like to help your project by pointing out two things that I think you should consider fixing in your own product:

1. The Jolla tablet is made of a very bad quality plastic. I keep my Jolla tablet in a sleeve and hardly use it these days, but the plastic is still deteriorating. The build quality is poor: the device is squeaking.

2. The battery life is sub-par. My 4-year-old Core i7 laptop lasts longer on battery than the Jolla tablet. Not sure if this is a software or hardware issue, but it needs to be looked into.