An electrically-powered wearable device (e.g., skin patch) designed to continuously or intermittently measure and record multiple physiological parameters [e.g., heart rate, respiration rate, electrocardiogram (ECG), haemoglobin oxygen saturation (Sp02), haematocrit] using one or more technologies [e.g., photoplethysmography (PPG), reflectance pulse oximetry, electrocardiography, accelerometry). The data is typically transferred to a smart device or central database for analysis or for remote monitoring (e.g., of dialysis patients) by a healthcare professional. This is a single-use device.