Computer 3pin Fan Speed Control Adapter Cooler Switch 4pin IDE 12V Power Input
4pin connector is input, 3pin connector is output (connect to fan). 4-pin connector is power input, 3-pin connector is output connect to fan, do not reverse. Working with all 12V fan, support 1.5A, 2.4A, 3A ,3.3A, 3.9A, 4.8A.