A wireless network card is a portable network access device that converts cellular data signals or wireless networks into network connections that can be recognized by terminal devices (such as computers and tablets) through a built-in wireless module (such as 4G/5G or WiFi). It supports multi-band communication and high-speed data transmission, and is compatible with USB direct plug-in or SIM card slot design. It is suitable for mobile office, car navigation and non-fixed broadband scenarios. It has plug-and-play, low latency and encrypted transmission characteristics, and can quickly build a stable network environment to meet high-bandwidth requirements such as remote collaboration and real-time streaming.