Needing a gps on my bike, I took this shell for my samsung S4. Easy to set up on the handlebars of the bike, I am amazed to see that it does not move despite the speed. I'm just disappointed by the Hull clipping system of fixing: one must have the strength in the hand (I could not leave the cover on the handlebars at the risk of my fly off). The transparent window allows me to use the same laptop in the bag.