Contec CMS50DL Fingertip Pulse Oximeter, Blood Oxygen Saturation Monitor (SpO2) with Pulse Rate Measurements and Bar Graph, Digital LED Display, Blue

Display Mode: LED display.
SpO2 Measuring Range: 0%~100%(the resolution is 1%).
Accuracy: 70%~100%: ±2% ,Below 70% unspecified.
PR Measuring Range: 30bpm~250bpm(the resolution is 1bpm).
Accuracy: ±2bpm or ±2% (select larger).
Measurement Performance in Weak Filling Condition: SpO2 and pulse rate can be shown correctly when the pulse-filling ratio is 0.4%. SpO2 error is ±4%, pulse rate error is ±2 bpm or ±2% (select larger).
Resistance to surrounding light: The deviation between the value measured in the condition of man-made light or indoor natural light and that of the darkroom is less than ±1%.
Power Consumption: less than 25mA.
Voltage: DC 2.6V~3.6V.
Power Supply: 1.5V (AAA size) alkaline batteries × 2.
Battery Working Hour: The minimum continually work time is 24 hours, the theoretical number is 56 hours.
Safety Type: Interior Battery, BF Type.