Product Description ------------------- Multi-Tech air purifier is equipped with advanced sensor technology which automatically monitors air quality. The built-in sensors detect the presence of dust, allergens, and odors. When detected an LED light indicates the amount of pollution detected. Use for these Models XJ-3800, XJ-3800A, ST-3800A, HF380A, HF380 Box Contains ------------ 1 x Replacement Ture HEPA & Carbon Filter ( 2 In 1 ) for ST-3800A Air Purifier