LTE Cat. M1 is a licensed standard that requires a license to use the radio frequency band, and it is ideal for cases where IoT needs to minimize costs and power consumption even if speeds are slow. LTE Cat. M1 is particularly suitable for mobile communications, such as when devices are moving, and because it uses licensed bands, radio interference is less likely to occur, and speeds are faster, allowing it to be used for wearable devices in IoT and other applications.