Features: <br>classic design, multiple colors, no external power supply, suitable for desktop andputers, <br>support hot plug and unplug, low power consumption, products for u disk, card reader, usb mouse, usb keyboard, scanner, digital imaging machine<br>digital camera, usb sound card, hard disk box and other equipment, extend 4 usb ports, each power supply up to 500ma, use the 2nd generation usbhub controller, without driver program, plug and play, support hot plug and unplug, support up to 127 usb devices. <br>all use the first - class quality electronic devices to ensure the stability of the product. <br><br>specifications: <br>operating system: win95osr2/98 se/me / 2000 / xp, linux2.4 andmacos8.5 vasta above<br>transmission rate: up to 480mbps<br>power supply: usb5v/600ma<br>external power supply: 5v/1.5 a-2a<br>hub: the use of temperature 0 â„ƒ to 70 â„ƒ<br>the hub of the storage temperature: 10 â„ƒ to 90 â„ƒ<br>hub usage humidity range: 10%-90%non_condensing<br>hub's storage humidity range: 10%-90%non-condensing<br>hub's ontology consumption current: 50-60ma<br>(the consumption current of this product is 25ma for each usb port when no device is connected. )"<br><br>package included: <br>1 x usb concentrator<br><br>notes: <br>1. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the pictures. <br>2. Due to the manual measurement and different measurement methods, please allow 1-3cm deviation. Thanks!