Features: It protects your valuable data by keeping your computer cool High-quality large airflow-, low noise, long Servicehours, good running stability and corrosion resistance. Made of high-quality material, it is durable in use,perfect design for high compatibility and excellent compose Features efficient heat dissipation and low noise motor Widely used for anywhere & electronic which need cooling.Such as Humidifier/ Aromatherapy and other small product. PC Server- / CPU / Notebook / 3D printer cooling system etc Specifications: Item: USB Fan Material: ABS Size:approx 4x4x1cm/1.57x1.57x0.39in 4x4x1.5cm/1.57x1.57x0.59in 4x4x2cm/1.57x1.57x0.79in Fan speed:5500RPM for 4x4x1cm Fan speed:5500RPM for 4x4x1.5cm Fan speed:4500RPM for 4x4x2cm Note: Please allow 0-3mm error due to manual measurement. pls make sure you do not mind before you bid Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes: 1PCx Cooling Fan