Lab-Line Undercounter Refrigerators are available in two models. R4056-2 has an adjustable thermostatic control. It comes with two adjustable wire shelves and three door shelves. R4056-3 has an adjustable hydraulic thermostat control. It features three adjustable wire shelves and three door shelves. Key lock for security. ABS plastic interior with enameled steel exterior. Magnetic vinyl gaskets for positive door seal. CFC-free insulation and coolant. Both units are manually defrosted and are UL listed.