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Monitoring Oxygen Saturation Over Time Alerting To Dangerously Low Oxygen Levels Indicating Dangerous Side Effects In People Taking Drugs That Affect Breathing Or Oxygen Saturation Specification： Name: Fingertip Pulse Oximeter Display Format: LK87 LED color dipslay Power Requirement: 2*1.5V AAA alkaline battery (not included) Power Consumption: Smaller than 30mA Voltage:DC 3.0V (AAAx2 battery not included) Screen Resolution:128*64 PR Measuring Range: 25bpm~250bpm SpO2 Measuring Range: LK87 70%-100% Fingertip Pulse Oximeter Package include： 1 x Fingertip oxygen monitor (battery not included) 1 x manual 1 x hand strap