Features: Experience powerful and quiet cooling with 2Pcs 40mm DC5V USB Mini Cooling Fans, to efficiently cool devices like 3D printers and routers. These fans feature a brushless design with sleeve bearings, providing high airflows for performances while maintaining low noise levels. for enthusiasts, office workers, and gamers seeking cooling for their electronic devices. for home Networking equipment, office environments, or as a portable cooling solution during travel, ensuring devices run smoothly and efficiently. Constructed from PBT plastic, these fan are easy to install with universal USB connection, making them addition to any setup. Specifications: Materials: ABS Size:40x40x7mm,40x40x10mm,40x40x15mm,40x40x20mm(optional) Package Includes: 2Pcs Cooling Fan note: Please allow 1-3mm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the picture may not reflect the actual of the item.