Simple USB key and that can attach to a keychain only when not in use, we must constantly detach fully to use. Apart from this flaw, it seems to have USB 2.0 type beginnings, then for a key to 128GB (theoretical because this is actually 117), which is called 3.0 is pretty annoying. Furthermore it very strongly heated and becomes hot for transfers of more than 10GB, I had never seen that. Better buy directly 128GB USB 2.0 key, it will cost you less and you'll have the same. Fortunately, it was at a fairly affordable price but next time I would take a SanDisk, not any surprises as to the quality and flows.