The driver operates the smartphone while driving has been prohibited by law.
After stopping the car at the safe place, operate the smartphone. This product is not intended to completely cut the sunlight. It depends on the irradiated position and angle of
Dedicated Prius navigation visor and smartphone holder
This is installed as it will not be visible at all when light hits the navigation from above. Although it is fairly effective, I think that it is better to have a longer eaves a little. It is convenient to open the upper side and keep the smartphone. I use smartphones when I can not search the destination in Navi.