Internal and external network free switching: support two-way switching, a total of 2 modes. 2 network interface input and 1 network interface output; 1 network interface input and 2 network interface output. Easily switch between Wide Area Network (WAN) and Local Area Network (LAN), protecting your computer from frequent plugging and unplugging. No power supply required: It can be used after connecting to the computer, no additional power supply is required. Real physical isolation, internal and external networks do not interfere with each other. Pure mechanical switch, effectively prevent IP series connection.