The Happy Ring contains the following sensors, making it the most accurate, powerful, and compact mental assessment device on the market: temperature, acceleration, photoplethysmography (PPG), and electrodermal activity (EDA).
The 2 temperature sensors measure skin and ambient temperature, the 4 EDA sensors measure electrical conductance in the skin, the 4-wavelength PPG sensor helps us derive heart rate and respiratory rate, and the accelerometer measures movement.