Features: Experience efficient cooling with this 4cm case fan, featuring optimized blade design for enhances airflows and super quiet operation under 20dB, ideal for small form factor PCs and gaming rigs. Engineered with noise reductions technology and multiple electric compatibility (5V 12V), this small fan delivers powerful airflows while maintaining whispers quiet performances in tight space . Perfect for enthusiasts, office professionals, and hardcores gamers search reliable heat management without disturbing mood noise levels. Effortlessly integrates into ITX builds, NAS servers, and small workstations, providing continuous cooling for coolers, PSUs, and chassis ventilation systems. build with strong ABS housing and not vibration rubber pad , this 40mm PC fan ensures corrosion resistant long and stable operation in temperature environment . Specifications: Material: plastic Size: about 40x40mm/1.57x1.57inch Type: multiple for option Package Includes: 1xPC Case Cooling Fan note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the differences between different monitors, the picture may not reflect the actual colorful of the item.