The OctaMon Mini developmental fNIRS packages, associated accessories, and software. The OctaMon Mini is optimized for performing measurements from the prefrontal cortex in children, and lightweight enough to not restrict any activity, including exercise. Like the other NIRS devices we offer, the OctaMon measures changes in oxygenation in terms of oxyhemoglobin, deoxyhemoglobin, and total hemoglobin. These devices can be applied in a variety of dynamic settings often required in research, while still providing the high data quality required of a laboratory research grade device.