The Green Lion Car & Home Fragrance Starry Sky Projection Air Freshener is a unique and high-tech device designed to enhance your driving or living space. This fragrance diffuser fits perfectly in your car's cup holder or any other interior space. It fills the air with a pleasant aroma and projects a starry sky to create a sense of tranquility. Powered by a 160mAh lithium-polymer battery, it is efficient and long-lasting, providing 3-4 days of continuous use.