Function Manual share switch box for DB9 serial port devices. Easily switch control between multiple serial devices without unplugging cables. Compatibility DB9 pin serial ports. Suitable for DB9 pin port devices such as printers, computers, and other serial equipment. Benefits and problem solving Eliminates the need to unplug and replug wires when switching between serial devices, reducing wear on connectors and downtime. Simple, reliable manual operation designed for quick device changes without tools or complex setup. Key attributes and construction designed to support common DB9 serial devices. Focused on straightforward operation, compatibility, and dependable performance. Use scenarios Office environment: Share a single serial printer between two computers by using the switch box, avoiding constant cable reconnections. Education or lab: Allow multiple PCs or lab equipment to access a single serial instrument or device without reconnecting cables each time. Securities and finance setups: Facilitate switching between trading terminals or serial devices while keeping connections secure and organized. Note: This description preserves the original scope and functions while presenting clear, customerfocused benefits and practical use cases.