Received very quickly - install quickly it's true that to position the helmet on the charging pin is a little tricky at first. no interference with other headphones without any interference filter behind the walls. but listening to different types of files (mp3, avi, etc.) a "click" means particularly annoying regularly. I refer the headphone hoping it's just that one that silliness. received after the new exchange: the more "click" untimely - great product.