About This

Middle part control modual combine 5-12V voltage step up and switch and speed Regulator, it is very easy for to control the fan
This USB adapter cable allows you to power most 3-pin and 4-pin computer fans from a USB type A port.
Cool down a wide variety of electronics devices that output USB power once powered on (consoles, networking applicances, professional equipment, etc.)
12V voltage step-up circuit: Inside the USB housing is a voltage boost circuit that takes 5V and outputs up to 12V 0.4A for full power operation. Additional devices such as fan hubs and speed controller can also be used.
Total cable length (including connectors): 32cm