4G LTE Category 1 (CAT1) is a cellular network standard specifically designed for Machine-to-Machine (M2M) communication in IoT devices. It provides upload speeds of up to 5 Mbps and download speeds of up to 10 Mbps — more than sufficient for sensor data transmission while consuming significantly less power than standard 4G.
Data loggers with built-in M2M SIM cards use 4G LTE CAT1 to transmit temperature and humidity readings directly to cloud platforms without requiring WiFi infrastructure. This makes them ideal for remote locations, transit monitoring, and facilities without reliable WiFi coverage.