Features Premium Control --- This controller can control the fan speed through smooth voltage reduction, supporting low temperature shutdown of fan power. Reliable in Use --- Control according to the temp, the fan speed regulator can largely improve the overall operation stability and efficiency. Applicable Fans --- Suits perfectly for the temperature control speed regulation on 2‑3 wire fan with DC 5V‑12V and current not exceeding 0.9A. The Working Tip --- Please ensure that the power supply voltage matches the fan voltage, and pay attention to the input polarity for wiring. If connected in reverse, it may burn out the FUSE position of the circuit board. Easy to Install --- Comes with a compact size and a light weight as well, the 1 channel fan speed controller is very convenient to install. Specification: Item Type: Fan Speed Controller Material: PCB Working Voltage: DC 5-12V, board working range of DC 4.6-13.5V, with out of range protection. Control Fan Current: 0.1-0.9A, poor fan control effect below 0.1A. Circuit Self Consumption: 10-30mA Temperature Probe Model: 50K B=3950 Circuit Operating Temperature: -10 ℃ to 60 ℃ Probe Temperature Resistance: 120℃ for small black head, 110℃ for round probe. Board Size Excluding Interface: Approx. 54 x 13 x 8mm / 2.13 x 0.51 x 0.31in, 7mm / 0.28in (approx.) fan interface protruding. Factory Default Settings: Basic speed regulation output Po=35%, acceleration temperature Tu=30 ℃, temperature control range Td=5 ℃ (35 ℃ full speed), and the fan does not shut down at low temperatures.  Package List:1 x Fan Speed Controller Package List 1 x Fan Speed Controller