Near Infrared-Light Spectroscopy
The ATALANTA uses medical grade cutting edge near-infrared spectroscopy (NIRS) to capture accurate, real-time vitals by reading the chemical composition of the blood.
Competition uses electrodes or green light
Electrodes require direct contact. In practice people sweat and this interrupts the contact thus the transmission of information. This can cause overheating and has been linked to skin burns.
Greenlight does not go as far inside the body as infrared light and is interrupted by ambient light. Skin also reflects light automatically, and combined by the fact that it can be affected by the color of the skin and the percentage of fat, it makes it a much inferior technology than NIRS.