Feature: 1. REPLACEMENT FAN: 140mm cooling fan for replacing standard computer case fans, gaming PC fans, CPU cooler fans or other electronic device radiator coolers. Provides effective silent cooling and is also an ideal replacement USB computer fan for your existing equipment. 2. ADJUSTABLE SPEED: The 140mm computer fan allows you to freely adjust the speed of your computer cooling fan as needed. The speed of the fan can be controlled by using different buttons to control the air speed, with high, medium and low air speed adjustments to achieve a silent effect. 3. USB POWERED: 50,000 hours of service life with dual ball bearings. The USB PC Fan increases the maximum speed of the axial fan and powers the fan via USB, simply plug it into an outlet and start the PC fan. 4. APPLICABILITY: Designed to meet the cooling and ventilation needs of a wide range of devices including computers, game consoles, home appliances, entertainment equipment, solar equipment and more. This flexibility allows you to adjust the fan operation to the level that best suits your environment, whether you need powerful cooling or a quiet working environment. 5. MULTIFUNCTIONAL USE: No matter what type of device you have, this 140mm case fan will ensure it stays at the correct operating temperature for improved performance and longer life. Specification: Item Type: Computer Fan Product Material: ABS Color: Black Input Interface: USB Rated Voltage: 5V Rated Current: 0.3A Power: 1.5W Airflow: 95.8 ±10%CFM Bearing: Double Ball Fan Speed: Maximum 2800RPM Wind Speed Adjustment: High, Medium and Low Three Wind Speed Adjustment Noise: 18‑28dBA Fan Size: Approx. 140x140x25mm / 5.5x5.5x1.0in Fan Blade: 7 Blades. Package List: 1 x Computer Fan Note: All data are measured manually, and there are certain errors in the measurement results.