[4 USB Ports Extension] Instantly turn 1 USB 3.0 port into 4 USB 3.0 ports. Plug and play, no drivers required. [USB 3.0 Super Speed] This USB data hub supports data transmission speed up to 5Gbps. [Aluminum USB Hub] Durable Aluminum housing USB 3.0 hub won't easily tip over when multiple devices connected. [Bus-powered & Self-powered] Equipped with 5V/2A power adapter allows power-hungry devices such as large-capacity external HDD with more stable data transmission. [Switch Control Powered USB Hub] Each port of the Aluminum USB 3.0 hub has its own power switch and LED indicator. The blue LED light flashes during data transmission. If the product you receive has quality problems, please don't worry, please contact us through the email on the card, if the product is confirmed to be defective, we are happy to provide you with a replacement product. Of course, we don't want to receive your email, because we want the product you receive to work perfectly ^_^