Wi-SUN is an abbreviation for Wireless Smart Utility Network, and in Japan it is called Specified Low Power Radio, and the frequency band is 920MHz.

The 920 MHz band can be used without a license*1, and it is less likely to cause radio wave interference with standards such as Wi-Fi, Bluetooth, and Zigbee, where the 2.4 GHz band is the mainstream, and long-distance data communication with low power consumption. It is a radio wave band that is possible. In addition, since it has better wraparound characteristics for radio waves than 2.4GHz, it is possible to ensure stable communication even in places with walls and other obstacles. ROHM is a member of the Wi-SUN Alliance and has been a member since the standard was launched, and is able to provide indoor and outdoor communication modules for IoT. ROHM's Wi-SUN module has also acquired technical conformity certification in Japan and can be used immediately.