After the power supply is plugged in through DC5V port, the USB port can drive the maximum 3A load (the maximum withstand current of USB port is about 3A, so it is not suitable to use USB for larger current, and the maximum current does not exceed the current of external power supply). The module is equipped with high-quality filter capacitor, thus improving the quality of power supply. Built-in automatic switching MOS circuit, USB5V and external 5V not . USB power supply enhancement module, 5V external power supply. DC 5.5x2.1mm power supply interface and USB3.0 interface. Product features: Automatically switch the 5V power supply of USB and the external DC5V power supply. When the external 5V power supply is plugged in, the 5V of USB is automatically disconnected through MOS tube, which enhances the power supply and loading capacity of USB. When the external 5V power supply is not plugged in, the MOS tube is turned on, and the 5V of USB is still output, which only plays the role of filtering the USB power supply. Color:Blue Material:PCB Package Contents: 1 * USB Power Boost Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.