1. It adopts the second generation photocatalyst which is newly researched by Japan Element-flash Company Ltd and uses 253.7nm band C high intensity cold cathode ultraviolet lamp. It can kill various mildews completely, clean up various peculiar smells inside cars and discompose harmful gases such as benzene and formaldehyde, etc. 2. It can discharge 3.8 million minus ions in one second, which will create a fresh forest environment. 3. Highly active HEPA filter can filter 99.9% dust and smoke in the air. 4. Ultraviolet lamp can kill 99.97% harmful germs. 5. Pure natural plant essential oil made by Japan Changguchuan Company Ltd is presented along with the product.