Solar Power: The exhaust fan uses the solar panel as the power source, equipped with a standard USB voltage regulator to keep the output, it can be used outdoors anytime, anywhere, convenient and fast. High conversion efficiency: The efficiency of single crystal solar cells is up to 20%. Outdoor solar panels can effectively convert sunlight into electricity. Made of high-grade monocrystalline solar cells with 22% conversion efficiency. High-quality materials, and a structure, makes it last up to 20 years. Say goodbye to noisy exhaust fans! Our brushless exhaust fan features high airflow and whisper-quiet, it ensuring your peaceful environment is maintained. Wide range of applications: Suitable for kitchens, greenhouses, pet houses, chicken houses, tree houses and RV, etc., maintaining comfortable temperature levels., Weight: 1.20813319576 pounds, Manufacturer: Prterver