Finger pulse oximeter measuring O2 (SpO2) and heart rate. Specifications Measurement range of pulse rate: 25bpm-250bpm Accuracy of SpO2: 70%-100% ±2% Accuracy of pulse rate: ±1%/ ±1bpm Power consumption: 40mA Operation environment: Temperature(°C): 5~40, Relative humidity: 80% Boot method: Push button to boot Power supply: 2 × 1.5V AAA alkaline batteries Display: LED Dimension: (58 × 33 × 33.5) mm Weight: 35g (without batteries) Automatic shutdown time: 8s Package included: Batteries x 2 User Manual What is a Pulse Oximeter? Our pulse oximeter is a device that is placed on your fingertip. It uses light beams to estimate the oxygen saturation of the blood and your pulse rate. Oxygen saturation gives information about the amount of oxygen carried in the blood. The pulseoximeter is able to estimate the amount of oxygen in the blood without having to draw a blood sample.