The pulse oximeter can be used to measure human hemoglobin saturation and pulse rate through the finger, and indicate the pulse intensity through the display field. Suitable for home, office use. Features: The product's operation is simple and convenient. The product is small in volume, light in weight, and convenient to carry. The product's power consumption is low and AAA batteries can work continuously for 20 hours. The product will automatically shut off when no signal is found in the product within 5 seconds. The pulse oximeter has small volume, low power consumption, convenient operation, and is portable. Suitable for use in homes, offices, oxygen bars, or other public places. Specifications: Power: 2 * AAA (not included) SpO2 Measuring Range: 70-99% SpO2 Measurement Accuracy: +-2% SpO2 Measurement Resolution: +-1% Pulse Rate Measuring Range: 35-250BPM Pulse Rate Measurement Accuracy: +-1BPM Operating Temperature: 5-40°C Display: Digital tube Power Consumption: 35mA Stable Measurement Time: >= 20s Package Weight: 30.8g / 1.1oz Package Size: 59 * 33 * 33mm / 2.3 * 1.3 * 1.3in Packing List: 1 * Oximeter