Indispensable when you have an iPad or Mac hardware. Of course, it is suitable for other materials, but all the DD wifi are not compatible directly on Iphone / Ipad. The Kingstone it allows direct playback but also copy files .. In writing, it is not very fast, it's his shadow alone. It is small in size, lightweight and efficient and that's all I demande.Bonne her life if care is taken to protect the small start-up button that tends to cling to the bag and the light alone. (I've filed down ..) I recommend it to those who like to travel light.