Features:1.It supports high speed (5G Mbps), full speed (480 Mbps) and low maximum speed (12 Mbps) profiles of USB devices.2.Circuit design for the prevention of reflux, to prevent the flow of electric current back to the device.3.Automatic switching between self powered and providing bus - powered supports plug and play.Description:Durable quality , for long time use.Specifications:Color: blackDimension: 1.7x4.2x1.1 cmCompatible with the USB version: 1.1 / 2.0 / 3.0System requirements: for Windows XP, for vista, for win7, for OSPackage included:1 X 4 Port HubNotes:Due to the difference between different , the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the pictures. Thank you!Tips：Welcome to DreamyMarket. We will provide you the better service , the higher quality goods and the lower price. If you have any doubt about our product, please get contact with us, and we give you the answer as fast as possible.After you pay the bill, we promise you we will update the order to ready to ship.Once updated, we would ship the order in 24 hours,note that Saturdays are included in our time lines, during which our drop-off centers are operational. Before you sign the express ,please check up whether it has been broken. If you are satisfied with our product and our service, please give us the review of 5 stars as the recognition for our work.And you can add our shop in your collection so that once we have any pro motion or the thing you want is price down, we would sent an e-mail to inform you.If you are unsatisfied with us, please contact with us, we could give you the best solution.Hope you have a good experice in our shop!DreamyMarket is waiting for you!a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a