Technical Parameter SpO2 1.Measurement range: 0-100% 2.Accuracy: +-2% during 70%-100% +-3% during 60%-69% Pulse Rate 3.Measurement range: 30bpm-250bpm% 4. Accuracy: 1 bpm or +-2%. Take the bigger one Visual Displays and Indicators: 5. SpO2 % display: Red LED. Variable brightness 6. Pulse Rate display: Green LED, variable brightness 7. Pulse intensity: Red LED 8 bars 8. Power Indicator Light: Green; Normal Low Power voltage: Red and Blink 9.Low perfusion indicator: Red bar Audio Indicator: 1.Probe off audio indicator (every thirty seconds) 2.Pulse audio indicator 3.Key-pressing indicator 4.Low power voltage Environmental Specifications: 1. Temperature Range: Operating: (0 -- +50)C 2.Transport/Storage: ( -40 -- +70)C 3. Relative Humidity: Operating: 10-95% 4.(noncondensing) Transport/Storage: 0-95% 5. Vibration: Meets or exceeds ASTM 4728 (Method C) MIL-STD- 810E. (Method 514.4, Section 1.3.4.3) IEC 68-2-37 6.Drop/Shock. Meets or exceeds IEC 68-2-32 (Procedure 1) MIL-STD- 810E. (Method 516.4, Section 1-3.6, Procedure IV) Power Requirements: 1.Four standard ''AA'' size alkaline batteries Battery Life: 2. Twelve Hours Safety Standards: 1. EN60601-1 (IEC-601-1) 2.GB 9706-1 Regulation Complied: 1. Quality System: ISO 9001 ISO13485 Dimensions: 2.24cm*16cm*7cm Net Weight (with batteries / without batteries) 3.195g/100g Gross weight: 480g Package: 1. 1 set into one box in size 24cm*16cm*7cm and gross weight 1kg; 2. 5 sets to one carton in size 37cm*25cm*18cm and gross weight 5kg; 3.10 sets to one carton in size 48cm*37cm*18cm and gross weight 8kg. 4.20 sets to one carton in size 37cm*35cm*48cm and gross weight 15kg