Validation Study of Frontier X Plus (FX+) Device

While lying down, subjects will wear the FX+, a chest strap device which will measure cardiac electrical activity to generate a continuous heart rate measurement. Simultaneously, electrodes for the 12-Lead ECG will be placed on the chest and arms/legs to record the electrical activity. Two 30-second recordings from the FX+ will be taken simultaneously with the 12-lead ECG with no more than a 3-minute interval between the two recordings.