What's included: incubators include two adjustable electro polished steel shelves and a 7-ft cord with three-prong plug unique energy-efficient Peltier Solid-state heating and chilling element eliminates the need for refrigerants and CFC Peltier-based element heats and Chills with precise control even at ambient—ideal for forced degradation of antibiotics, protein crystal growth, and applications that require ambient temperature control use the built-in RS-232 to connect to a 286 or better computer clear plastic inner door allows you to view your samples while maintaining chamber environment programmable digital display timer with audible alarm and Auto-off up to 99 hr., 99 min.