Ozone exists in the ozone layer region of the atmosphere to protect human beings from the sunlight. We also sense its fresh and clean smell after thunderstorms.Before ozone treatments, please do some cleaning in order to remove the source of the odors. Close the windows and doors. Make sure nobody and no pets are in the room.It's highly recommended to set the timer and leave it in the room. Treatment time can be adjustable according to the room size and air quality. If you have no clues, you can start with 10 min, and increase the treatment duration or frequency for the next time.You can take out your ozone generator and schedule an ozone treatment whenever you suffer from odor issues.Package list: 1* Ozone generator 2* power cord (UK and EU）2* user manual (English and German)CAUTION: Ensure that no people (and also pets) in the room when it's working. 
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