Features: The Fan Speed Controller can only control the 12V standard 4-wire PWM fan, control the internal circuit transfer of the 4-wire fan through the PWM signal. Speed controller is made from great circuit board which ensures a longer service life. Fan speed controller, small size, high performances, saving operation space. PWM speed controller adopts PWM control technology to realize temperature control and speed regulation. Make sure that the positive and negative connections are correct before powering on, and the wiring should not touch the heat sink, which may burn the circuit board. Specifications: Material: Plastic Size: Approx. 3.4x1.9x1.3cm/1.34x0.75x0.51inch Working voltage: DC12V (can operate within the ranges of 8-18V) Current consumption does not exceeds 20mA The fan current interfaces can bear 3Amp Fan interfaces: 2510-4P(1 missing 1 elbow) PWM output: 10%~100% Working temperature: -10°C-60°C Package Includes: 1x Fan Speed Controller note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.