Features: 1. the Pwm Frequency is 25Khz, Which Can Adapt to Most 12v Adjustable Speed Fans on the Market. 2.Input Voltage: 12V 3. Temperature Measurement Range From 0C to 125C 4. the Temperature Probe is A 10kb Ntc Probe with A Value of 39501%, and the Temperature Measurement is Accurate. 5. Computer Case Fan Multi-Channel Speed Regulator Pwm Speed Controller Module Description: Interface Introduction Note: Do Not Cover the Fan Blades, the Fan Will Start When the Power is Turned On. Insert the Temperature Probe. If the Temperature Probe is Not Connected, the Wind Speed Will Be the Minimum Value. If the Socket of the Temperature Probe on the Board is Short-Circuited, the Wind Speed Will Be At the Maximum Value. Connect to 12v Voltage Through 6pin or 4pin Atx Interface or Terminal Block. the Fan Changes Speed As the Temperature Changes. (Different batches may have differences in product appearance, color, and printing, which do not affect use) size: 50mm x 38mm Material: PCB colour: Package Contents: 1 x Nine-Channel PWM Fan Control Board (NTC Temperature Control and Speed Regulation Version) Module Only the above package content, other products are not included. Note: Light reflection 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.