If you understand basic DC wiring you cant mess this up. Real bonus; I cant believe how comfortable they are. The only time Ive had it die before I got home I was gone over 13 hours using it near constantly. Im going to stop raving about them now, just give them a go, perfect if you can find a supplier with free returns if you dont agree. Everything fits on this rack besides the 10s which we store elsewhere. Manageable with normal socks on, but thicker "winter" socks will make the shoe more snug (with my feet at least). Its the summer in Texas, so too hot right now for these anyways. There are no control buttons on it so you cant pause or advance to the next track. I purchased some cheaper ones on Amazon made for the quest and decided to try these as well and man did they blow those other ones away. single layer; flip flops are supposed to be light and simple; trust me.