Package contains: 2 pieces of 30mm mini cooling fan 5V DC with cable leads Size: 30mm x 30mm x 10mm (length x width x thickness). Rated Voltage: DC 5V Rated current: 0.18A Rated Power: 0.9W Speed: 10000 R/min. Air volume: 3.45 CFM. Noise: 31.6 dbA. Material: plastic frame and blades. This 5v silent mini brushless cooling fan is low-noise, low-vibration, reliable running. DC 5V powered ,easy to be connected with your computer motherboard or 3D printer power system. Allows your development boards or other experimental tools to quickly dissipate heat and will extend the working life.