Features: The DC4020 cooling fan delivers powerful airflows with low noise (20dB) thanks to advanced hydraulic bearings and double ball bearings for electronics. Built with ABS housing and optimized frame design, 40x40x20mm fan engineered with energy efficient motor technology, ensures efficient heat dissipation through enhanced air circulation, supporting continuous operating in high temperature devices like printers and networking switches. Perfect for gamers, PC enthusiasts, and electronics hobbyists requiring reliabled thermal management solution for performances critical equipment such as server racks, NAS systems, and compact communication devices. Seamlessly integrates into printers, players, PC CPU coolers, server chassis, and DVR systems, providing essential ventilation for small spaces where overheating threatens device stability and longevity. Specifications: Component： ABS plastic,oise. Parameters: Low noise design Dimensions: about 40x40x20mm/1.57x1.57x0.79in Suitable for small computer case/router/vitural reality glasses and any small electronic device for cooling and ventilation Power： 5V/12V/24V Optional Package Includes: 1PC 4020 cooling fan note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.