The John Bunn DigiO2 Finger Pulse Oximeter provides fast, reliable and accurate oxygen saturation SpO2 , pulse rate and perfusion index or pulse strength measurements. Its compact design makes it an ideal solution for EMS, hospital and clinical settings along as well as for home use. Features Performance Lightweight, pocket-size solution Provides fast and accurate SpO2, pulse rate and pulse strength measurements. Large LED color display that allows for easy-to-see day or night use Simple one button operation Automatic power on/off function shuts off after 8 seconds of non operation to conserve batteries Display Oxygen saturation SpO2 , pulse rate and PI measurements. Bar graph display. Multi-directional display so readings can be viewed from any angle. Display Range SpO2 35% to 99% Pulse Rate 25 to 250 bpm Perfusion Index 0.2% 20% Accuracy % SpO2 ...............75% 99% 2% ...............50% 75% 3% Pulse Rate Accuracy 25 to 250 bpm 2bpm Perfusion Index 0.2% 2% 0.1% 2% 10% 1% 10% 20% 2% Alarms Audible and visual alarms for Low Battery, Low SpO2, High Pulse Rate, Low Pulse Rate Pre-set Alarm Limits Low SpO2.....................90% Low Pulse Rate.............50bpm High Pulse Rate............120bpm Resistance to surrounding light The difference between the values measured in the condition of indoor natural light and that of a darkroom is less than 1%. Includes 1 DigiO2 Finger Pulse Oximeter 1 lanyard 1 Pouch 2 alkaline batteries 1 User Manual Specifications Power Supply Requirement Two 2 1.5V AAA alkaline batteries Operating Temperature Range 41 degrees F to 104 degrees F 5 degrees C to 40 degrees C Operating Relative humidity 30% to 80% Operating Atmospheric pressure 10.15 psi to 15.37 psi 70kPa to 106kPa Storage Temperature Range 4 degrees F to 131 degrees F 20 degrees C to 55 degrees C Storage Relative humidity 95% Size 2.59 x 1.42 x 1.3 66 mm x 36 mm x 33 mm Weight 60g including batteries Warranty 1 Year Warranty 1 Each / Each