Features: brand new and high quality Through the step-down line, the starting voltage of the fan is reduced, thereby reducing the speed of the fan and achieving the effect of mute; Features 3 Pin Male to Female Connector. Easy installation. Long service for time. Designed with a resistor on the cable. Quite practical and useful. Use the 3-pin cable to connect the power supply to your cooling fan, it will reduce the speed of the fan and cut the noise output dramatically. As a general rule, the faster the fan spins, the more the speed reduction will be. There is no standard value for the deceleration speed. The marked deceleration value is an approximate range for reference. Specifications: Scope of application: 3-pin interface fan Plug Type: 3 Pin Male to Female Optional Resistance: 27 (white)/37(Blue)/ 47(Red) Main Materia: PVC Main Color: White/Blue/Red Total Length: approx 12cm / 4.72in Net Weight: 30g Note: Resistance heating during use is a normal phenomenon There might be little error of size for manual measurement. The colors deviation might differ due to different monitor settings, please kindly understand. Package includes: 5PCS x Fan Resistor Cables