The Stone Diffuser scents your home naturally and looks beautiful while doing it. With a matte ceramic cover and sculptural silhouette, it doubles as a piece of decor. With a full feature set and beautiful packaging it makes the perfect gift for someone looking to add ambiance and wellness to their space. Built to last: Lifetime warranty Run Time: 2 time settings (4-hour continuous and 8-hour intermittent) to scent on your schedule. Safety feature: Automatically shuts off when either the time setting is done or the water runs out. Ambient light: Optional LED light that gives off a soft glow. Scenting capacity: Scents rooms of up to 500 square-feet, making it perfect for bedrooms and living rooms.