Vacuum Portable Notebook Laptop Cooler USB Air External Extracting Cooling Fan for Laptop Speed Adjustable for 15 15.6 17 Inches 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 Product Dimensions: 175x86x52mm Fan Size: 75x75x25mmRotational speed: 1500-300010%RPMAir flow: 75.35CFMRated Speed: 1350rpm10%Air flow:109.3CFM10%Rated Voltage: 5V DCCurrent: 0.410%Power cord length:60cmBearing Type: Dual Ball BearingNoise: 15dBA (Min.)Gro Weight: 245g 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 About Product: 1.We promise all the photoes display on our store are taken by our team , it is real and 2% brightne adjustment . 2.Before sending , all the product will be tested , when packing item , we will use the Foam sponge to protect the product , we will make sure you will receive the perfect product .