Dual power source ventilation Harness solar energy during daylight hours or connect via USB for continuous ventilation. This provides a longlasting cooling solution regardless of weather conditions, and it maintains fresh airflow day and night without draining your car battery. General car compatibility and installation Designed to fit most vehicle windows with adjustable solar panel positioning and secure selfstrips (84*4 cm). The unit features a compact ABS construction measuring 16*10*3.5 cm, enabling effortless installation while ensuring sunlight exposure for maximum energy efficiency. Heat reduction technology Actively lowers cabin temperatures by up to 15°F through efficient air circulation, creating a more comfortable driving environment on hot days. The fan helps reduce heat buildup and windshield fogging for improved visibility. Air purification and airflow elimination system Continuously refreshes your car interior by expelling stale air, smoke, and unpleasant smells while drawing in fresh outdoor air. Improves air quality during daily commutes or extended travels. Use scenarios Daily city commute on hot days: Solar power delivers cooling without affecting the car battery, keeping the cabin more comfortable as you drive. Long road trips or parking with USB power: USB connection maintains ventilation and air freshness when the vehicle is in use or temporarily parked. Humid mornings or foggy conditions: Reduces windshield fogging and enhances visibility for safer driving. Materials and construction ABS housing provides a lightweight, durable enclosure designed for easy installation and reliable operation. The system is built to operate with solar exposure and USB power as needed, ensuring versatile performance across weather conditions.