Display Type: LED display SpO2: Display range: 0-99% Resolution: 1%Accuracy: 70-99%, ±2%; 0-69% no definition. Pulse Rate:Measurement range: 25-250 BPM Resolution: 1 BPMAccuracy: ± 1BPM/± 1% BPM(Take the larger value)Power Requirements: 2pcs AAA batteries Environment Requirements Operation Temperature: 5°C~40°C Storage Temperature:-10°C~40°C