The B 35 cold box is a compact desktop device that requires less space and is used in laboratories for cooling and freezing. Its cooling unit also emits less noise. The cold box is perfect for direct use in the laboratory. It has a capacity of -85°C to -50°C for the B 35-85 model and -50°C to -10°C for the B 35-50 model. It has a large interior with external dimensions that are small. It also consumes less power. Moreover, its casing is made of all stainless steel. The refrigeration unit is low noise, air-cooled, easy to maintain, and hermetically sealed. The B 35-85 model has a two-stage cascade refrigeration system and a foamed door that has a double seal. The interior does not have fixtures and has a side air vent so it can be directly installed on the wall. Also, it has a control unit that comes with a keyboard and an integrated and optically isolated alarm that is mains-independent. The alarm sends audible and visual signal and shows maximum temperature. The battery lasts for approximately 72 hours.