In addition to the high-resolution audio codec and GPS receiver functions provided by the SPRESENSE board computer for IoT supplied by Sony Semiconductor Solutions Corp., the Wi-SUN Add-On Board (SPRESENSE-WiSUN-EVK-701), the Sensor Add-On Board (SPRESENSE-SENSOR-EVK-701) and Bluetooth®LE Add-On Board (SPRESENSE-BLE-EVK-701) add Wi-SUN wireless communication function, sensor capability and Bluetooth®LE communication function that contributes to the development and evaluation of advanced IoT devices. The Wi-SUN Add-On Board adds the latest communication standard of Wi-SUN to SPRESENSE, enabling long distance communication with low power consumption. It also includes slot for sensor expansion board, facilitating the development of IoT devices.