["Feature:\r\nUSB Fan Air Conditioner\r\nStrong winds and weak wind adjust freely\r\nStepless Speed Regulation\r\nFan Speed Regulation principle:\r\nThe non-adjustable fan is a 5V direct fan motor,while the two-stall fan is the interior has a step-up circuit board,when placed in the second gear,the boost plate will be USB 5V up after the motor,the air volume is big!\r\nThe stepless speed governor output voltage range of 2.5V to 8.0V between the smooth change,the amount of free air flow set!and a wider range!Clockwise twist knob can increase the air volume,counterclockwise twist will reduce the air volume,and knob with switch function!\r\n\r\nSpecifications:\r\nPower supply Range:DC 4~12V\r\nOutput Range:DC 2.5~ 8.0V\r\nRated Power:5W (Please do not overload use)\r\nSuitable for the very common 5.0V USB fan on the market\r\nHow to use:\r\nGovernor male Insert mobile phone charger,charge treasure, computer USB,fan Plug and then insert the Governor for head can!Or use the Micro USB 5.0V power supply.\r\nAttention matters：\r\nFor two-shift fan,please place the fan in one gear,or you may not be able to adjust speed!\r\nNote:\r\nPlease allow 1-3mm error due to manual measurement.pls make sure you do not mind before you bid.\r\nDue to the difference between different monitors,the picture may not reflect the actual color of the item.Thank you!\r\n\r\nPackage Includes:\r\n1x USB Fan Speed Controller"]