1.100% new and hight quality 2.The mini USB cooling fan is high speed ,low noisy 3.With a large range to cool 4.Fixed convenient 5.Infinite speed switch can adjust the air volume   specification Product Dimensions: 175x86x52mm Fan Size: 75x75x25mm Rotational speed: 1500-3000±10%RPM Air flow: 75.35CFM Rated Speed: 1350rpm±10% Air flow:109.3CFM±10% Rated Voltage: 5V DC Current: 0.4±10% Power cord length:60cm Bearing Type: Dual Ball Bearing Noise: 15dBA (Min.) Gross Weight: 245g   user tips Begin to use, in order to fast cooling, open to the largest (3000 RPM), temperature drop down, About 15 minutes, transferred to the minimum (1500 RPM) remains constant, so that we can keep in a reasonable working temperature, and can prolong the service life and lower noise. Common problem: Q: power supply way? The power cord length? A: use USB 5 v power supply, wire about 60 cm long. Q: this product has several silica gel set? A: in order to meet the requirements of different computers, configuration of four different sizes of silicone sets