Features: It protects your valuable data by keeping your computer cool High-quality large airflow, low noise, long service hours, good running stability and corrosion resistance. Made of high-quality material, it is durable in use, perfect design for high compatibility and excellent composition Features efficient heat dissipation and low noise motor Widely used for anywhere and electronics which need cooling, such as humidifier, aromatherapy and other small products. 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. Please make sure you do not mind before you purchase Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes: 1 x Cooling Fan