Key benefits External power option for current peripherals The power input port is reserved at the upper left corner of the board and marked as the 5Vin position. When you connect current peripherals and the 5V current from the USB input port is insufficient, you can enable the external reserved power input port to supply additional current. This helps prevent under power issues and keeps devices operating reliably. Stable operation with low heat and low power draw Designed for steady performance with minimal heat generation and efficient power use, even when multiple devices are connected. Easy expansion with a 4 port USB 2.0 hub Expand your connectivity quickly and conveniently with four USB 2.0 ports to support a range of peripherals. What it is and how it works Four port USB 2.0 hub Provides four downstream USB 2.0 ports for connecting multiple devices to a single host. 5Vin reserved power input A dedicated external power input port is available and located at the upper left corner of the board, clearly marked as the 5Vin position. This external power can be enabled to supply additional current when the USB input alone is not enough. External power enable when needed If a connected device draws more current than the USB port can provide, you can enable the external reserved power input port to ensure stable power delivery to all connected peripherals. Compatibility and performance Compatible with standard USB 2.