4 GHz and 5 GHz spectrum so this can result in random connectivity issues even under ideal situations. The large zippered compartment is roomy enough for snacks, shorts,tshirt, hat, etc. Everything else was leather. It gets a little bit of whip as you get heavier, but not a lot. There are more. Bought for my son with school at home via zoom. I struggled installing them by myself. Love the way they auto-power off when folded. What on earth teva? Why fiddle around with sizing??? So i have had the bother of returning them and ordering a size 8. 6k.