Add up to 4 devices quickly and easily with the SABRENT USB 2. 0 Rotatable Hub. Great for newer notebooks that come with a limited number of ports. Maximize your time by obtaining access to plug in multiple USB devices instead of having to choose just one . Achieve full 480 Mbps on each port, or daisy chain multiple hubs to a maximum of 127 devices. Fully backwards compatible with the USB 1. 1 products. Please Note: For a stable connection, the devices connected to the 4 Port Hub must not exceed a combined current of 5 volts 500mAh. External hard drives should be connected to an external power source. This 4 Port hub will not charge your devices, it will only sync them. Package contents: SABRENT Rotatable 4 Port USB 2. 0 HUB