Feature: 1. O3 Air Purifier which effectively eliminate any unpleasant smells like smoke odor, pet odor, basement odor, car odor, new decoration odor, paint fumes and other odors. 2. The timer function can be set up to 0-120 minutes and you can also use the "HOLD" mode to keep it on. 3. Simply turn the timer knob and leave the room, make sure that no one (and pets) are in the room when the O3 machine is working. 4. Apply the O3 processing one or two times a week for normal use. If you still smell the vestigital odor in the room after processing, please increase the O3 processing time. 5. All O3 generator can only be used in unmanned spaces. Allow 15 to 45 minutes after processing time is finished before occupying the space, or open the outside windows and doors upon reentry. Specification: Specifications: Material: Aluminum alloy + Plastic Item Size: 183 * 171 * 132mm / 7.20 * 6.73 * 5.19in Item Weight: 1607g / 3.54lb . Package List: 1 * O3 Generator 1 * Power Cord 1 * Warning Sign 1 * User Manual (English)