What is the frequency range used by Ultra-Narrow Band (UNB) systems?

Ultra-Narrow Band (UNB) systems operate within a frequency range that is less than 1 kHz. This extremely low-frequency range allows UNB systems to be highly efficient in terms of power consumption and enables them to transmit data over long distances with minimal energy, making them ideal for various IoT applications.

The characteristics of UNB are particularly advantageous in scenarios where devices are battery-powered and need to maximize the lifespan of their power source. Additionally, operating in this low-frequency range allows UNB systems to perform well in environments with significant interference, as they can effectively penetrate obstacles and maintain communication.

In contrast, the other frequency ranges provided in the options do not align with the specifications of UNB systems. Those ranges correspond to different types of communication technologies, such as short-range RF communications or other forms of wireless data transmission that do not exhibit the unique benefits offered by the Ultra-Narrow Band approach.