Lightweight: Portable and easy to use outdoors. Real-time instant readings: Data storage and analysis function. OLED display: Simultaneous display of test values ​​and saturation chart. Product Description: The fingertip pulse oximeter is an economical and accurate way to detect pulse rate and oxygen saturation through your fingers. It is suitable for testing blood oxygen saturation and pulse rate in hospitals, homes, schools, and medical centers. Specification: Color: Blue Model: LK87 Display Type: OLED Screen SpO2 Measurement Range: 70% ~ 99% Accuracy: ±2% on a stage from 80% to 100%; ±3% on a stage from 70% to 80%; below 70% no requirements Resolution: ±1% PPR Measurement Range: 25 BPM ~ 250 BPM Accuracy: ±1 BPM or ±1% (greater than) PI Measurement Range: 0 ~ 20 (Optional) Power: 2 x AAA 1.5V Alkaline Batteries Power Consumption: Less than 30mA Automatic Shut-Off: The product automatically shuts off when no finger is present for 8 seconds in the operating environment Operating Temperature: 5°C ~ 40°C Storage Temperature: -20°C ~ 55°C Ambient Humidity: 15% ~ 85% Non-condensing Dimensions: 6.40 x 3.90 x 3.60 cm What's in the Box: 1 x Pulse Oximeter, 1 x User Manual