TrendNet, a popular company that makes networking hardware has introduced two new USB 3.0 adpaters. The TU3-H2PIE model priced at $50 and the TU3-H2EC model pricet at $60.

TU3-H2EC modelhas two USB 3.0 ports for connecting various devices. It is backward compatible with USB2.0 which means you can still use your old USB2.0 devices with it. Designed for a laptop, itt plugs into any available Expresscard slot for instant access to 5GBPs tranfer speeds. The card powers devices through a external power adapter.

TU3-H2PIE model is designed for personal Computers, plugs into any PCI-E Slot and is backward compatible with USB2.0 just like the TU3-H2EC. It gets power through the PSU with a 4pin power connector to run any plugged in devices.

Source