Features: -Fingertip pulse oximeter. -Portable, non-invasive spot check oxygen saturation and heart rate. -Two AAA batteries can be continuously operated for 30 hours. -Latex free. -2 year limited warranty. Specifications: -Oxygen saturation display range: 0-100%, OLED. -Pulse rate display: 18-321 pulses per minute. -Oxygen saturation declared accuracy range(Arms): 70-100% Sp02 +/- 2 digits. -Pulse rate declared accuracy range (Arms): 25-250 BPM +/- 3 digits. -Temperature: (operating) +41 to + 104°F (5 to + 40C). -Storage / transportation -22 to + 158 °F (-30 to +70 °C). -Device temperature will not exceed 41°C as measured in a controlled environment. -Operating 10% - 90% relative humidity, non condensing. -Operating Altitude: Up to 40,000 feet / 12,192 meters.