There are zero details, none, nada. All we know is Peter Lau designed this for people who can’t see, hence why the thing doesn’t have a screen, but how will blind people learn how to use this?
No matter how bad your day is remember that you can see, you can hear, you have food in your house and hopefully you don’t have any STD’s. Then anything that might be considered “troubling” is just laughable. No offense to starving blind and deaf people with AIDS.