Gebildet 12V Voltage Step-Up USB to 3-Pin and 4-Pin PC Fan Sleeved Power Adapter Cable+Splitter Cable 1 to 2 with Switch and Speed Regulator

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