【Without Ozone】253.7nm wavelength UVC rays, covers up to 400 sq.ft..【Timing Control】3-gear Timer: 5/15/30 mins, the light will turn on after 8 seconds (people can leave the room within this time), and automatically stop working after the time you choose. Screw the bulb into the socket to use..【Varieties of Applicable Spaces】For home use: bedroom/bathroom/closet etc. For Large place use: clinic/company/factory etc..【CAUTION!】Human/Pets/Plants can’t be exposed to the UV Light! Must Leave the room when lamp is working..【365-DAY WARRANTY】We provide high-quality after-sales guarantee, and pay great attention to your using experience, if you encounter any problems, please feel free to contact us. EPA EST NO. : 96998-CHN-1.【Smell of Sunlight】Even the ozone-free UVC lamps will make the air smell like the sun after use, which is NOT the smell of ozone!