No external power supply required. The printing port is powered via USB and can operate normally without an external power source. Durable black ABS case. Sturdy, resistant to falls and wear for reliable daily use. Broad compatibility. Suitable for a variety of devices; two computers can share USB devices to improve office efficiency. Printer sharing that reduces wear and cost. Two computers can share a single printer, eliminating the need to plug and unplug when switching prints, protecting equipment and lowering office costs. Use scenarios Small office or workgroup with two PCs that need to share a single printer and other USB peripherals. Easy switching without reconnecting cables. Home office with a desktop and a laptop. Share the printer and common USB devices to streamline printing tasks. Conference rooms or shared workspaces where multiple users access a single printer. Quick, cable switching reduces downtime and wear on ports.