HF2 Replacement Filters are designed for use with BLACK+DECKER 1.45 Gallon Ultrasonic Humidifiers. It is recommended to replace your Cool Mist Humidifier filter every 6 months. Replacement filters are sold in packs of 2 to provide up to 1 year of clean moisture. Ceramic infused filter softens water and reduces calcium build up to deliver healthy air moisture. Washable for easy set up and cleaning. Each filter measures 2.8" diameter x 3.74" L.Ceramic Infused Filter helps soften water and reduce calcium build up to deliver clean, healthy moistureFor use with BLACK+DECKER 1.45 Gallon Ultrasonic Humidifiers, model #BUHD055 and BUHDR055Each filter is recommended to be replaced every 6 months2-pack provides a 1-year supply for humidifier useEasy rinse to use and reuse up to 6 monthsWHAT IS INCLUDED WITH THIS ITEM? (IE: MANUAL, 16 OZ BLENDER CUP)2 filtersACTUAL PRODUCT DIMENSIONS (NOT GIFT BOX) INCHES:2.8" x 2.8" x 3.74"ACTUAL PRODUCT WEIGHT (NOT INCLUDING GIFT BOX) POUNDS:0.06Features: Easy SetupVoice Activation: NoVoltage (volts): 120vCountry of Origin: Imported