Features: Reserve the power input port at the upper left corner of board, marking the 5Vin position.. When a high current peripherals is connection and the 5V power supply current from the USB input port is insufficient, the external reserved power input port can be enable.. Stability, low heat, low power consumption.. Expand your connection effortlessly with our 4 port USB 2.0 hub, meet all your peripherals connection needs. This portable and lightweight hub offer data transfer rates and broad compatibility with various USB devices, ensuring a user experience. Specifications: Component:PCB Type:1Pc/10Pcs Size:Approx.2.95x1.89cm/1.16x0.74inch Package Includes: 2 Optional Package: Package 1 Include:1Pc Usb 2.0 Expansion Module Package 1 Include:10Pcs Usb 2.0 Expansion Module note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.