Product Description 1. Digital Technology, 2. Alarm with freely set limit. 3. Accurate measurement during low perfusion 4. Anti-Movement, Stable Performance 5. Built-in rechargeable battery and seat-type charger; Power-Saved Function 6. Built-in memory card for data memory; Connection with computer for downloading data 7. Bright, Easy-to-Read LED Numerals 8. Lightweight, Portable 2 parameters: SPO2 + Pulse Rate Specification 1. SpO2 Measurement range: 0-100% Accuracy: -2% ~2%during 70%-100% -3% ~3% during 60%-69% 2. Pulse Rate Measurement range: 30bpm-250bpm Accuracy: 1 bpm or -2% ~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