While small in stature, the OWC Envoy Express is big news. For the first time ever in the history of Thunderbolt, you can buy a bus-powered Thunderbolt certified enclosure and install your own drive in it. Finally... a DIY kit that lets you break free of pre-configured choice limits so you can build a pocket-sized storage solution to meet your specific needs. And rebuild it anytime those needs change. Equally revolutionary is the slide mount. This surface-safe removable drive holder allows you to slide the Envoy Express onto the back of your laptop's screen for out-of-the-way mobile use convenience.