● This USB Cable Allows You To Power Up To 2 Case Fans (Both 3-Pin And 4-Pin) From A USB Connection ● 12V Voltage Boost: Inside The USB Housing Is A Step-Up Circuit That Boosts The USB 5V To 12V Allowing PC Fans To Operate At Full Speed ● High Quality Construction Features Upgraded 22 AWG Power Wires And High Density Black Sleeving ● NOTE: Due To USB Port Current Limitations It Is Not Recommend Using Fans That Combined Require More Than 0.5 Amps At 12V ● Cable Length (Including Connectors): 22" / 55cm