1. Digital Technologyç«ÂÂ�ccurate measurement during low perfusion 2. Anti-Movement, Stable Performance 3. built-in chargeable battery and seat-type charger for long time using. Power-Saved Function 4. Bright, Easy-to-Read LED Numerals 5. Lightweight, Portable 6. Built-in memory card for data storage;connect to computer and save data; optional blue-teeth function 7. 2 parameter: SpO2+Pulse Rate General Character 1. SpO2 ��Measurement range: 0-100% ��Accuracy: ±2% during 70%-100% ±3% during 50%-69% 2. Pulse Rate ��Measurement range: 15bpm-400bpm ��Accuracy: 1 bpm or ±2%. Take the bigger one 3. Visual Displays and Indicators: ��SpO2 % display: Red LED. Variable brightness ��Pulse Rate display: Green LED, variable brightness ��Pulse intensity: Red LED 8 bars ��Power Indicator Light: Green; Normal Low Power voltage: Red and Blink ��Low perfusion indicator: Red bar 4. Audio Indicator: ��Probe off audio indicator (every thirty seconds) ��Pulse audio indicator ��Key-pressing indicator ��Low power voltage 5. Environmental Specifications: ��Temperature Range: Operating: (0 -- +50) °C ��Transport/Storage: (-40 -- +70)°C ��Relative Humidity: Operating: 10 ? 95% ��noncondensing) Transport/Storage: 0 ?95% 6. Power Requirements: ��Four standard ?AA? size alkaline batteries 7. Battery Life: ��Twelve Hours 8. Regulation Complied: ��Quality System: ISO9001 ISO13485:2003