This really is the smallest USB key that I have ever seen! Just 2 cm long, 1.5 cm wide and 0.6 cm thick! A true scale model that can store 4GB anyway! This key has been immediately recognized by my macbookpro, so no worries on that side. The only complaint I could make it, is that there is no cord that comes with, then an opening is provided for. A key of this size can slip quietly but all can be lost just as easily!