Finger Pulse Oximeter Blood Oxygen Spo2 Monitor The product is shipped based on the color or size of the main image of the product page. We aim to show you accurate product information. Manufacturers, suppliers and others provide what you see here, and we have not verified it. The Fingertip pulse oximeter shows your measured SpO2 and Pulse Rate on a high-quality OLED screen (with six multi-directional display choices). Comes with two critically acclaimed features, the Sleeping monitoring and Perfusion Index (PI), that will improve the reliability of the readings dramatically. The PI conveniently informs you ofthe strength of your pulse. The sleep monitoring function can keep the data record for 8 hours. Also comes with a lanyard so that you can use the pulse oximeter for convenience carrying.Specifications: SpO2 :Measurement range: 70-99%. Resolution: ±1%. Accuracy: ±2% (70%-99%), unspecified. 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 x2 (not included in package).