Pulse Oximeter with vibrant TFT color display. Measures: SpO2, PR, PI% Multi-directional display screen for viewing results from 4 angles. Description Features: PI% Indicator: Perfusion Index. It reflects the amount of blood flow being measured by the oximeter. A health care professional tests blood flow to establish norms and aid in identifying changes in a patient’s condition. SpO2% indicator PRbpm indicator TFT display: Dual Color TFT multidirectional display. 4 directions, 6 modes, allow you to view your results in any angle. Long battery life: Low-power consumption, allowing 6 hours of continuous use. In the absence of a signal, the unit will enter standby state after 8 seconds. Specifications: SpO2: Measurement range: 70~99% Resolution: ±1% Accuracy: ±2% (70%~99%), unspecified (<70%) Pulse rate: Measurement range: 30~240 bpm Resolution: ±1% Accuracy: ±2bpm or ±2% (select larger) Low Perfusion ≤0.4% Power: 1.5V (AAA size) alkaline battery x 2 Supply voltage: 2.6~3.6V Working current: ≤30mA Automatic power-off Automatically powers off when no signal in the oximeter for more than 8 seconds https://www.ppe-mart.com/product/pulse-oximeter-portable/