4G USB Dongle is a 4G internet module with a USB interface. It has a 4G antenna interface, 1 SIM card slot, 1 TTL serial port, and 1 Debug serial port. Anti surge protection design. LTE CAT 1 network, supporting Windows/MAC OS/Linux system direct insertion. Widely used for instrument data collection and upload, sensor data collection and upload, meteorological station data upload, etc.