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Compact 40mm Waterproof DC Cooling Fan for Electronics. Energy Efficiency: Utilize up to 70% less energy compared to traditional fans. Ultra-Quiet Operation: Operate silently, perfect for bedrooms, offices, and libraries. Long Lifespan: Engineered with high-quality components built to last. Easy Installation: Designed for effortless setup within minutes without professional help. Adjustable Speed: Customize airflow with multiple speed options for specific needs. Waterproof Design: Available with IP55/IP68 waterproof functions. PWM Speed Regulation: Features unique speed output and PWM control capabilities. Global Certifications: Passed CE, RoHS, and ISO9001 certifications.