Wang Global is your only source for cost-effective and efficient negative ion generators. Our items have original designs that benefit everyone - including allergy and asthma suffers, babies and expectant mothers, students, hospital patients and others. Compact and lighweight, our featured unit boasts silent and low-power operation for tabeltop or wall-mounted use. And it works-continually refreshing the air and prooviding an allergen-free healthy environment. The swmart negative ion generator (CA-301) overcomes the practical limitations of conventional ionizers. Amazingly, due to its low energy consumption, continuous massive anion release is now possilbe, providing users with full coverage. Plus, its patent-pending four-piece smart control module design outlasts inferior one-ionizer models that can burn out or quickly lose effedtiveness. This item features no filters or chemicals, and carries CE, RoHS, WEEE and BSMI marks.