W.I.N.I.T.S. is a cost-efficient vital sign monitoring system based on a novel wearable biomedical device, W.I.N.I.T. Band. The device can be attached to a patient’s finger during mass casualty incidents, providing first responders, paramedics, and hospital staff with real-time updating of vital signs on an online dashboard and a small screen on the device, eliminating the need for patient reassessment. W.I.N.I.T. Band wirelessly and non-invasively measures cuffless blood pressure, heart rate, blood oxygen (SpO2), and body temperature in real-time. The algorithms automatically adjust to each patient, so they do not require calibration. W.I.N.I.T. Band improves on existing commercial monitoring systems by eliminating the need for blood pressure cuffs and electrocardiogram (ECG) attachments.