SP300 Finger Pulse Oximeter is a small, lightweight and portable device suitable for use with either adults or childrenThis Pulse Oximeter is an ideal diagnostic tool for ambulance paramedics and emergency medical technicians working at the roadside. SpO2%, PR and Pleth waveforms are displayed on screen, The display can be easily rotated to display in 4 directions, Simple and convenient operation OLED display, Extremely compact weighing only 50g including batteries, Low power consumption, two AAA batteries can be continuously operated for 20 hours, Adjustable background brightness, Range: 30-235 BPM, Accuracy: +/- 2 BP<, Latex free