WINSINN 40mm 5V USB Fan - Dual Ball Bearing 5000 RPM Cooling Fan Replacement for PC/CCTV/Camping Power Bank/USB Devices, 1M Cable Brushless 40x10mm (4Pcs)

【Versatile Usage Scenarios】Ideal for cooling small electronics like 3D printers, Raspberry Pi cases, routers, VR glasses, and DIY projects. This 40mm 5V USB fan (40x40x10mm) offers a maintenance-free solution with its dual ball bearing design for long-lasting performance. 【High-Performance Cooling】Delivers 4.69 CFM airflow at 5000 RPM (±5%) with a low noise level of 26 dBA. The dual ball bearing ensures smooth, quiet operation while providing efficient cooling for compact devices in high-heat environments. 【Key Specifications & USB Convenience】Rated at 5V DC, 0.07A, and 0.35W, this energy-efficient fan features a 1m USB cable for easy power from any USB source-perfect for use with power banks, laptops, or adapters. 【Certified Quality & Durability】CE, FCC, and ROHS certified for safety and compliance. The dual ball bearing supports a lifespan of up to 50,000 hours, allowing 24/7 operation without maintenance-ideal for continuous use. 【Package Contents & Installation Tip】Includes four 40mm 5V dual ball bearing USB fans at an affordable price. Before installation, ensure your device’s voltage matches the 5V rating to guarantee safe and effective cooling.