Pura & Sweet Grace Car Diffuser SetA car scenting experience unlike any other. Smart Control: Set and adjust the intensity of your fragrance through the app or manually with the push of a button. Push once to go from high intensity to medium, once more for low intensity, and again for sleep mode. Automatic Start & Stop: Your diffusers accelerometer detects motion, so it automatically turns on when you go and stops when you stophelping you save fragrance while keeping you hands free.