The 2014-2015 Proteus Digital Health Clinic team added functionality to an existing wearable device by using optical detection techniques to measure biological signals from the torso. Through the use of photoplethysmography and electrocardiography, the team targeted metrics such as heart rate, blood oxygen saturation, blood pressure, and hydration. The team conducted testing to identify optimal wear locations and wavelengths of light for detecting these metrics. Algorithms were constructed to characterize the data and provide useful information for patients and caregivers.