1. By using the ultra-violet lamp and photocatalyst technique to produce ultra-violet light and CO2 to efficiently attract mosquitoes. 2. Kill bacteria, elimilate odor. 3. The photocatalyst also cleans the air as a by-product. This product is extremely suitable for homes, offices, hospitals, hotels and restaurants, as it is odorless, smokeless, nontoxic, noiseless, energy saving, safe and high efficient