Small, lightweight device used to monitor the amount of oxygen carried in the body. All-in-one integrated finger device with simple operation for immediate, real-time spot-checks which provides reliable accuracy and durability. Automatic power off design. SpO2 measurement range: 0-100%. SpO2 interval: 1%. Pulse rate measurement range: 25-250 bpm. Pulse rate interval: 1 bpm. Weight including batteries: 54g. Battery operated (AAA batteries x 2). Dimension: 57 x 33 x 30mm.