we are the most important R&D and production base of air purifiers, car ionizers etc. in China, we have the following competitive advantages, first we have strong ability of R&D to develop 20 particular new models annually, furthermore, we have strict quality control system. We operate strictly according to the ISO9002 standard during the period of research, purchase, manufacturing, technology arrangement and quality control. we are glad to tell you that our products enjoy good sale in Europe, USA ,Japan, Korea etc. For more details, please kindly visit our homepage http://www.ada1997.com to check it.