The FaceLake FL400 Blue Fingertip Pulse Oximeter is a lightweight, portable device used for measuring both heart rate and blood saturation (SPO2). Simply place your finger inside the antimicrobial vinyl sensor and have these measurements instantly displayed on a large LED screen. Features a battery-saving automatic power-off function, and is also latex free. NOTE: This product is intended for sports and/or aviation use only and is not a medical device.