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Package includes 1 x Oximeter 1 x Lanyard 1 x User manual Display tape: LCD display SpO2 measurement range: 70%~99% Accuracy: ±2% on the stage of 70%~99% Unspecified(≤70%) for SpO2 Resolution: ±1% PR measurement range: 30BPM~240 BPM Accuracy: ±1 BPM or±1% (the large one) Power: two AAA 1.5 V alkaline battery Demission: 2.3 inch * 1.4 inch * 1.3 inch Operation environment: Operation Temperature: 5℃ - 40℃ Storage Temperature: -10℃~40℃ Air Pressure: 70kPa - 106kPa Note: This fingertip pulse oximeter is for sports and aviation use only, not intended for medical use. Batteries not included.