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Technical Features Display SpO 2 , PR - Anti-natural light interference - Battery Type: 3.7v (150mAh) Rechargeable Lithium - Working Voltage: DC 2.2V ~ DC 3.4V - SpO 2 : Measurement rage: 35% - 100% Accuracy: ±2% 80% - 100% ；±3% 70% - 79% - Pulse Rate: Measurement rage: 25 - 250bpm Accuracy: ±2bpm ; Resolution: 1bpm - Size: 28(L)x29(W)x47(D)mm
