Thermo Scientific REB3004A has an audible/visual warnings for temperature deviations or power failure. It digital electronic technology designed to simplify operation and deliver greater accuracy is preset for 4 Deg C operation while its adjustable temperatures range from 1 Deg and 8 Deg C. Its high-density, CFC-free urethane foam insulation protects cabinet from ambient temperature fluctuations and minimize operating costs while its sensor automatically initiates defrost cycle on demand, eliminating need for a defrost timer, minimizing frost buildup, and optimizing coil efficiency. This unit also features cold-rolled steel cabinets with smooth, scratch-resistant painted finish for easy cleaning and door-activated on/off switch and independent switch on panel, adjustable leveling feet and more. REB3004A is a reliable refrigeration system for blood bags and other temperature sensitive products.