Features: 1.Customer friendly design, small and light 2.One button operation, easy for use 3.Color OLED display 4.Waveform, data, pulse intensity display simultaneously 5.Anti-interference mode 6.Low signal management, low perfusion intensity: = 0.3% 7.Multi-direction display, convenient for use and observance 8.Low power consumption design , Auto power off after 8sec no signal input 9.Internal rechargeable Li battery, convenient and saving power Specifications: Patient range: Adult, pediatric, neonate patients SPO2: Measurement range: 70% ~ 100% Accuracy: 1% ( 86% -100% ) 2% ( 70% -85% ) Resolution: 1% Pulse rate: Measurement range : 30-250bpm Accuracy: 1bpm Resolution 1bpm Display mode: High Brightness Color OLED Display area: 25( W) x15( L) mm Function : low battery alarm Auto power off after 8sec no signal input Supply input : DC 2.8v-5.4V Battery : 3.7-4.2V , 500mAh Li-ion rechargeable 4 hours continuous working Environment Temperature: Working : 0-50 degrees Transport and Storage: -20-60 degrees Humidity: Working: 15-95% ( no-condensing) Transport and storage: 10-95% ( no -condensing) Atmospheric Pressure: Working : 86 KPa-106KPa Transport and storage: 50KPa-106KPa Dimension: 30( W) X27( H) X60( D) mm Weight: 45G Standard Configuration: 1 Main unit 1 Operation manual