The V-Air Flow System delivers consistent, long-lasting fragrance for up to 30 days - without the use of aerosols. Made from 100% post-consumer recycled plastic, the dispenser combines smart fan technology and the Venturi Effect to evenly distribute fragrance throughout your space. Designed for efficiency, it automatically increases fragrance output in cooler temperatures (below 59°F/15°C) and conserves energy by shutting off in the dark. Technical specs: Refill Life: 30 days Best suited for spaces from 800 to 2,000 cubic ft Requires 2 C Cell Batteries Dispenser Dimensions: 8.07"x 3.82"x2.76" Dispenser Weight: 0.75 lbs