Designed for the home or office, creates healthier air. Eliminates musty odors caused by mold and mildew. The upper chamber features 360 deg venting to create great airflow. Lid locks safely, wide sturdy base, spill-proof design to prevent leakage in the event the container accidentally tips over. Last up to 60 days depending on the temperature conditions. Environmentally safe, septic safe, will not harm houseplants or animals. Box of 4. Use (SKU 366.7185) for refills.