Product Description This is product is manufactured with advanced gas detection sensor technology to check the air pollution indoor automatically. It is highly reliable and operates without manual control. When the pernicious gas reach a certain degree which match the preset value, the product starts its air ventilation function. When the pernicious gas drops down to the preset standard, the fan stops and stays at monitor status. The product is widely used in the office, reception area, shopping mall, hotel, restaurant and household. Product Technical Value Specific voltage: Ac 220V specific frequency: 50Hz Monitor consumption<1W React density value: Smoke >100PPm Carbon monoxide> 50PPm formaldehyde> 4.2mg/CBM