Inner chamber made of stainless steel, outer chamber made of powder coated mild steel sheet with high quality insulation material between the walls. Microprocessor based temperature controller with preset temperature 4 degree centigrade plus minus 1 degree centigrade .and digital temperature display. 50 htz 220-240 volts Ac power supply (single phase power supply in India). Audio-visual alarmis given .. 7 day circular temperature chart recorder- in built.. Air circulation fan. Light bulb inside chamber. Auto defrost mechanism or frost free, CFC free.