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 moisture For use with BLACK+DECKER 1.45 Gallon Ultrasonic Humidifiers, model #BUHD055 and BUHDR055 Each filter is recommended to be replaced every 6 months 2-pack provides a 1-year supply for humidifier use Easy rinse to use and reuse up to 6 months WHAT IS INCLUDED WITH THIS ITEM? (IE: MANUAL, 16 OZ BLENDER CUP) 2 filters ACTUAL PRODUCT DIMENSIONS (NOT GIFT BOX) INCHES: 2.8" x 2.8" x 3.74" ACTUAL PRODUCT WEIGHT (NOT INCLUDING GIFT BOX) POUNDS: 0.06 Features: Easy Setup Voice Activation: No Voltage (volts): 120v Country of Origin: Imported