reading that, it seems to be about consumption/receiving data rather than the sending of data. or do you have light shining out of your laptop back at it? ther

reading that, it seems to be about consumption/receiving data rather than the sending of data. or do you have light shining out of your laptop back at it? there is an example of a school using it, and the students have a usb device in their laptop to read the light, but is it slow upload or are they also connected to wi-fi?