Stainless Steel and Aluminum construction. Safety interlock switch for access doors deactivates the unit automatically when the door is opened. View Port for quick visual inspection of lamp condition. Phillips Sterilamps®, PL-L 60W TUV, have no more than 4.5 mg mercury content and produce no ozone. Philips Sterilamps® are wind-chill corrected. 120 through 277 V AC 50/60 Hz operation.