The QuantumZERO USB 3.0 4-Port 12V 2.5A Powered Hub expands USB connectivity of your laptop, desktop or tablet. With external power supply it ensures your devices receive enough power they need for uninterrupted operation. 4 USB 3.0 SuperSpeed ports support data transfer rates of up to 5Gbps (640MBps), saving your time. Product Features: Instant access to 4 USB 3.0 SuperSpeed ports. Compact design, sturdy built, smooth mirrored surface finish. VIA VL812 Rev B2 chipset with latest firmware for best performance and widest compatibility. Data transfer rate up to 5 Gbps (640MBps) (actual rates depend on device and computer USB host controller). External power supply ensures your devices receive enough power they need for uninterrupted operation. Built-in surge protector keep your devices safe. Backward compatible with USB 2.0 Hi-Speed devices (rates up to 480Mbps), and USB 1.1 Full/Low Speed devices (rates 12/1.5 Mbps). Blue LED lights indicate operation. Plug and play (individual devices / USB 3.0 host controller may require drivers), supports hot swap. Product Specifications: Product Name: USB 3.0 4-Port 12V 2.5A Powered Hub. Product Model: QZHB05. Chipset: VIA VL812 Rev B2. Output Interface: USB 3.0 Type B port. Input Interface: 4 USB 3.0 Type A ports. Dimensions: 117 x 157 x 60 mm. Weight: 120 g. System Supported: Windows 10/8.1/8/7/Vista/XP/2000/Me/98, Mac OSx9.1/10.2 or above. Color: Black. Driver: No need, Plug and Play. Special Notes: To achieve the maximum output current of 3.4A at 900 mA, the hub must be powered by both the external power adapter and the computer turned on. To ensure a stable connection, the connected devices must not exceed a combined current of 3.4A. This is especially important for any devices with high power requirements such as 'self-powered' hard drives which draw power from the USB port.