Fan Speed Governor Air Volume Adjust USB Fan Switching Module 2pcs Aluminum For Office Use

Fan Speed Governor Air Volume Adjust USB Fan Switching Module 2pcs Aluminum for Office Use Specification: Item Type:Fan Speed Controller Material:Aluminum Input Voltage:DC4~12V Output Voltage:DC2.5~8.0V Rated Power:5W Package List: 2 x Speed Controller Note: How to use: Insert the governor into the mobile phone charger power bank computer USB etc. plug the fan and plug it into the governor! Or use Micro USB 5.0V to supply power. For two-speed fans please put the fan in one gear otherwise you may not be able to adjust the speed!