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Specification Product Name Portable Ultra Low Temperature Freezer Type DW-4525 Storage Volume 25L Electric Power 100V AC to 240V AC;50Hz,60Hz;12V DC to 24V DC Maximum Power 100W (0@220V,4@24V) Cooling Engine Free-piston Stirling Engine Refrigerant Helium (He) Heat Transport System Gravity pushed thermosiphon Temperature Range 25℃ to Minus 45℃ Environmental Conditions Non-corrosive, Non-flammable,Non-explosive,Altitude as a lot as 2000m Temperature 5℃ to 35℃,maximum relative humidity 80% Performance Data Ambient temperature is 25℃;Empty Cabinet Take 3 hours from 25℃ to Minus 45℃ Steady State Energy Ambient temperature is 25℃ 30W Insulation High functionality vacuum insulated panels, polyurethane foam Noise <50dB Control Sensor One RTD(PT100 Class B),precision±0 Defrost Method Manual Certification CE/EMC、CE/LVD、CQC Interior(LxWxD) 300*250*300mm Exterior(LxWxD) 616*392*455mm Net Weight, Empty 17 Shipping(LxWxD) 710*472*522mm Shipping Weight 20KG