This dry formula timed mist aerosol is perfect for use in most common metered aerosol dispensers and is designed to last over 30 days. Unlike other metered aerosols, Claire eliminates messy fall-out on counters and floors and is V.O.C. compliant for sale in all U.S. states. The spray helps eliminates smoke and other malodors and lasts for over 30 days. Uses 2 "C" size batteries, Approximately 8.5" tall, Lasts over 1 year depending on settings, Slim, compact dispenser with a variety of features and functions to meet your odor elimination needs. Key lock mechanism, 3 Interval settings (7.5, 15 & 30 minutes), 24 hours/night/day, and Red light symbolizes empty can. To open the dispenser, press down on the button on top, pressing towards the front of the dispenser, and the back of the dispenser will pop open.