Mobile Stand For Acu Evac IE 2 (2 Parts Trolley and Handle) Suction Units 5 V Battery (Not Included)Power 5 V Battery (Not Included)Power Consumption: Less Than 30mAWorking Temperature: 5 ℃ 40 ℃Storage Temperature: 10 ℃ 50 ℃Relative Humidity: 15% 80% (Non condensing)Hemoglobin Saturation: 94 ~ 100Pulse Rate: 50 ~ 130Hemoglobin Saturation Display: 35% to 100%Pulse Rate Display: 30 250BPMHemoglobin Saturation Resolution: 1%Pulse Rate Resolution: 1 BPMHemoglobin Saturation Accuracy: 2% (70% 100%) Unspecified (≤70%)Pulse Frequency Accuracy: 2BPMSPO2 put two ice packs in the freezer whose temperature is around 15 to 20°C for fully frozen The unit has four wheels Isolated from vibration