Describe High quality LED, each LED corresponds to the corresponding USB working status.Constructed of high quality aluminum alloy shell, ensuring effectively cooling and improve product anti-interference ability.20-Port USB Charging Station charges and syncs up to 20 tablets, smart phones and other USB-equipped devices at the same time.Each individual port capable of delivering up to 5V/1200mA, enough for charging battery-intensive devices like the Apple Pad.Fully compatible with USB 1.1 and USB 2.0, support hot-swappable, no drive, easy to use and carry.Support Win7, Window Vista, Windows XP Professional/Home Edition, Window98/ME/2000 Professional/Home Edition, MACOS 9.0 and higher editions. Specifications Enclosure Material Metal Port 20 Ports Input USB 2.0 Type-A Power Supply 120W (12V 10A desktop power supply) Max Each Output 5V/1200mA Support System Windows XP/Vista/7/8 & Mac with USB support LED Light Color Blue Dimensions (LxWxH) 11-13/16"x3-11/64"x59/64" (300x80.5x23.5mm) Net Weight 15.87oz (450g) Package List 1 x 20 Ports USB2.0 Hub 1 x USB Cable 1 x Power Adapter 1 x Power Line Features Through the computer to add the fans, post messages etc. on the phones at the same time.All the phones display on the screen and chat with different clients or friends.Keep the marketing safety, avoiding blocking.Connect the phones to install and move the software. Applications Connect the AC cord to the 12VDC/10A power adapter, and then connect to the power outlet.Connect the USB cables to computer and Hub.The AC power line connects to the Hub, makes sure the power switch is ON, and the power LED light indicates Red. At this point each USB port outputs 5V, and you can read and write.After use, please store them properly. How to Charge the Devices Conncet the power cord to the hub, insert the power plug into the socket of wall mounted, don't need to connect to the computer. (As it will active sync mode once connected to the computer.)Connect each device to an USB Port with original USB Cable. How to Synchronzie ('sync') all attached devices Connect the computer to the hub with original USB2.0 Cable.Connect the devices to the USB ports begin go data sync.Open the Syncing software (e.g. iTunes Configurator) on the connected computer and wait until you can see all deviced listed.Sync the devices.