It comes with a key ring clip that unscrews (part attached to the key chain, the other to the USB key and is just a screw 2). She quite heated on 3.0 port, but I think it's related to port and not to the key. The speed is to go, of course it's not what it says, but it's better than my old key. Operates in 2.0 ( Recognized in Windows 7 (64-bit), Linux (Ubuntu 13) and Mac OS (Leopard). The size advantage is also a disadvantage, it is forgotten easily ^^. Is no diode to see if it is connected or not. Otherwise it is a very good buy for the price. The design is sleek, brushed aluminum effect is beautiful.