Most of the people in this community interested in Braille displays are going to be totally blind, and yet, your video has no audio at all. Also, it's just basic politeness to ensure that your video is audio described, or has all information in audio, if you're going to post it to /r/blind. Regardless, if you're that out of touch with the community, I really have no idea what you're doing advertising Braille displays. For all I know this is spam, and should be reported.