USB HUB: 1. Usb 2.0 high speed interface, supports transfer rate up to 480Mbps. 2. backwards compatible with USB 1.1 specification. 3. plug-and-play, support hot swapping function. 4. 4 USB plug itemize the two side,and have the mini usb plug and power plug. 5. you can want your logo print in the watch and very beautiful and you can choose it to gifts and publicity.