Durable black ABS case provides strength and long lasting reliability, with resistance to drops and abrasion. Compatible with a variety of USB devices and capable of sharing USB devices between two computers to improve office efficiency. No external power supply required; when connected to the printing port, it operates normally without an external power source. Share a single printer between two computers, eliminating the need to unplug and replug when switching between machines and helping protect devices while reducing office costs. Practical use scenarios: Small or home office with two computers needing access to one printer, simplifying workflow and saving equipment. Conference room or shared workspace where guest laptops require access to a central printer without complex setup. IT or classroom environments where two workstations need simultaneous but controlled access to USB peripherals.