Product usage: Power supply D port to take power, can start 2 channels of 12V and 2 channels of 5V fans at the same time! The 5V interface can be used to decelerate the fan, and it can be used as a deceleration line Instructions for use: Two-way 12V power supply, 12V fan is running at (12V is yellow/black/line, white is small 3Pin) Two-way 5V power supply, 12V fan using 5V can reduce the speed and reduce wind noise! (5V is red/black/line, black is small 3Pin) Because it is only used for power supply, each small 3P plastic shell is actually only connected to 2 wires. This power supply has no speed measurement and temperature control functions. [Product name]: 2-speed speed control line for large 4Pin to small 3Pin fan [Product voltage]: 2 channels 12V, 2 channels 5V [Product length]: 12.5cm [Wire Type]: 1007 22AWG [Insulation material]: PVC insulation [Conductor specification]: 17*0.14TS [Conductor material]: tinned copper [Wire outer diameter]: OD1.6mm [Rated temperature]: 80 [Wire color]: black, yellow, red, [Product weight]: 10 grams [product interface]: power supply large 4Pin to small 3Pin interface one point four (2 12V 2 5V) [Product function]: Solve the problem that the 3Pin interface is not enough to change the different interface to adjust the speed of the fan Colour: black Package Contents: 10 * 4Pin fan interface extension cable Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.