Pure metal material ,Anion function optional, Ultra quiet , Fashion Keyswitch, USB power LF-282 Mini USB FAN, Laptop USB FANu Function² Anion function² Ultra quiet² Fashion² Keyswitch² USB power² Material: metalu Specification² Product size: 149*96*146mm² Voltage: DC 5V² Power: 2.5±0.25 w² Net weight: 324g Anion Function Mini USB Laptop Cooling Fan