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Blood Oxygen accuracy at ±1% and heart Rate at ±1% (even under frequent movement and low perfusion situation), to get readings in just 5 seconds, SpO2 measuring range from 0% to 100%, PI measuring range from 0.2% to 20% Accurate and reliable measurement values, including Blood oxygen level(SpO2), heart rate(PR) and perfusion index(PI). Pulse bar graph and plethysmograph waveform which shows visual indication of the irregular, weak heartbeat or incorrect reading. OLED display screen to show both readings and waveforms with adjustable brightness for both indoor and outdoor environment. One Button Operation, Auto power-off after 5 Seconds. Intended for use in Sport/Aviation - For sports like climbing, cycling, running or anyone interested at measuring their SpO2 and heart rate. You can return your undamaged product within 30 days to receive a FULL REFUND for any reason. We're also offering 12-month warranty for quality-related issues.