The Spresense Sensor Add-On Board adds 3 types of sensors essential for motion sensing (acceleration, barometric pressure, geomagnetism) to the GPS receiver and high-resolution audio decoding functions provided by the SPRESENSE board computer. In addition, the Sensor Expansion Connector makes it possible to add more than 7 types of sensors, including brightness, proximity, color, magnetic, temperature, UV, and heart rate (pulse wave) sensors.