I have no real use for it and I assume it will only provide speed information to a sim. My review on these are mixed! I was even about to write a really positive review a few days ago until I suddenly noticed that where the wires connect in the casing had broken and the wires were beginning to get exposed. Great coat hook for garage entry door. On one of my attached photos I have tried to show show it from the side where you can see the metal colour of the iPad right next to the colour of the case. Its nice and warm just at the "waxing" node. This one fit every category perfectly. They arrived quickly and are beautiful and best of all, they?re super comfortable. I didnt think I would need this feature but already it has come in handy twice. I wont do that again.