These allowed us to watch the same movie on one device resulting in taking less electronics with us on our trip. I am an experienced automotive mechanic with extremely high technical aptitude and dont mind taking on a project. I was so disappointed. Reading reviews definitely gave me the gut feeling of walk away. Fit- many other reviews say to order up one size. und jetzt ratet mal wie voll die Box noch ist. They put just enough elasticity to accommodate those of us with really fat feet but its just the right amount to keep your feet feeling securely in place when walking. I always order 1 full size bigger on trail shoes, so I ordered a 9. Desktop amp or fairly powerful portable amp required. Been through 8 cases, different ones, and they all broke within a week.