The product is designed in accordance with the differential wiring specification at the hardware level, and has passed the industrial control-level EMI electromagnetic interference test. The built-in power supply is directly introduced from the power supply, which isolates the USB bus power supply and prevents interference from the motherboard and other electrical equipment. (pipeline) step filtering 2. Effectively filter ripple interference 3 Buffer for large clutter, its instantaneous buffer current can reach 5-6.8A to provide "0" Hz power supply quality for USB devices. Provide good pure power for USB-audio audio equipment. Humanized indicator light design, work status is clear at a glance. The green light (DATA) indicates that it is in the built-in power supply state. The red light (External Power) indicates the state of external power supply; Yellow light (Build in Power) prompts whether the USB signal is connected USB data and power supply: USB data, use good USB native signal. USB power supply, support internal/external two modes (PC SATA power supply and external power supply can be switched); Internal and external power supply can be judged by itself, switched automatically, and protected by itself. If the external power supply is lower than 4.8V or removed, it will automatically and seamlessly switch back to the built-in power supply. The equipment will not be lost or damaged. The external power supply is automatically disconnected after the PC is shut down to that the USB audio device is completely powered off, to prevent the no-load damage of the USB non-signal device, and to save the external power supply energy. There are various for external power supplies, especially optimized design for battery power supplies Automatic monitoring, automatically switch to built-in power supply when the battery loses voltage or is removed, without manual selection Automatically disconnect the external power supply without shutting down, protect equipment and save battery Filter the power supply ripple caused by the booster circuit of the mobile power supply Multi-band, , &2& power filter design, provide high stability, high power and pure current Power dynamic compensation technology, automatic compensation under large fluctuations, and constant supply of pure power with ripple (less than) Less than 1Hz! Multi-mode power input seamless switching, intelligent protection design is well considered. Maximum current: 5A Maximum Power: 25W Automatic power switching speed: Less than 5ms Ripple factor: Less than 1Hz Dimensions (PCB): 90 x 60 mm Material:ABS colour:Black Package Contents: 1 x USB-power source 1 x USB2.0 cable 1 x USB3.0 cable Only the above package content, other products are not included. Note: Light 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.