Smart Car Air Freshener: The smart car air freshener has a built-in micro-sensor chip that can quickly sense the start and stop of the car and perform intelligent start and automatic shutdown. 220MAH lithium battery provides ultra-long battery life and can last up to 45 days after charging for 60 minutes. Avoid occupying your car charger USB port for a long time. 3 Adjustable Modes: The smart car air freshener is equipped with ambient lights and provides three spray modes with adjustable spray intervals to meet different fragrance needs. Fresh fragrance mode: green light, spray for 0.2 seconds every 300 seconds. Light fragrance mode: blue light, spray for 0.2 seconds every 90 seconds. Strong fragrance mode: purple light, spray for 0.2 seconds every 10 seconds. After Sales Service: We provide a 1-year warranty for the smart car aroma diffuser. If you have any questions about the items you received, please feel free to contact us. We will solve it within 24 hours and provide replacement or refund. Please feel free to buy.