sterilization, no residual . It is used for disinfection, sterilization and elimination of odors in clean rooms of public , hospitals, factories and mines. Oxygen sterilization and deodorization, high vitality, wide and fast, no dead . The board is easy to carry and easy to use for professional DIY. Using high pressure, is generated from dry air or oxygen in the air. specification: Power supply: AC Function: In addition to formaldehyde Air volume: 301-400m3/h Style: Air Purifier Type: generator Noise: less than or equal to 40dB Benzene removal rate: 99% Formaldehyde removal rate: 99.90% Application area: 41-60 Installation: USB Wind speed: standard Usage conditions: household colour: blue Material: ceramic + aluminum Package Contents: 1 * 7g/h generator accessories Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.