Features: Lightweight and Easy-To-Use. Color OLED display, simultaneous display for testing value and plethysmogram Ajust the parameters in friendly menu. Big fonts mode is conveninet for user reading the results. Manually adjust the direction of interface. Low Battery voltage indicator Visual alarm function. Real-time spot-checks Automatically switch off when no signal. Standard two AAA 1.5V Alkaline Bаttеrу is available for power supply. Advanced DSP algorithm inside minish the influence of motion artifact and improve accuracy of low perfusion. SpO2 Measurement Range: 35-100% Resolution: 1% Measurement Accuracy: 2% (70%-100%) Unspecified (≤70%) Alarm Range: 50% ~100 % Pulse Rate: Measurement Range: 35-250 BPM Resolution: 1 BPM Measurement Accuracy: 2 BPM Alarm Range: 30% ~250 BPM WARRANTY: 1 Year