Features Fan Speed Controller Accurate temperature setting and precise control,high strength, high cost performance. The controller only controls the speed of the all standard four-wire chassis fan and CPU fan for Intel. When the temperature lower than the accelerated temperature, then output at the minimum rotation speed; when it exceed over the full temperature, then always output at full speed,Stable quality, praised. It integrates manual speed regulation and automatic temperature control and speed regulation function. When the corresponding open channel fan break down, the controller will alarm with sound and light (works with buzzle), alarm will automatically eliminated when the fan is rotated recovery,More professional and practical. Specification: Board Size: Approx. 5.3*4.5cm/2*1.7inch Positioning Hole Position: 44*37mm/1.7*1.5inch Positioning Hole Diameter: m Operating voltage: DC12V Circuit Load Capacity: Maximum current per output 4A, the bus currents up 9A Output Range: The First Channel: 20%-100% or 40%-100% (TFL=ON) The Second Channel: 10% -100% The Third Channel: 10% -100% Note: The above range only PWM range, the actual fan control effect will vary depending on the fan. Temperature Probe Parameters: 50K B=3950 Thermostat Temperature Zone Error: Generally 3-5% (Depend on the temperature probe) Stall Alarm Minimum Speed: 700-800 rpm Weight: Approx. 17g / 0.6oz Function Setting Switch Description: (Any changes to the setting must be repowered to start before it takes effect) TFL (No. 1): PWM channel with the lowest temperature setting, when ON, the lowest PWM of FAN1 is 40%; when OFF, the minimum PWM of FAN1 is 20% TP1 and TP2 (No. 2 and 3): Temperature channel control temperature zones are interpreted as follows (need to match the temperature probe used): TP1TP2Accelerated TemperatureFull TemperatureOFFOFF35℃45℃ONOFF40℃55℃OFFON50℃70℃ONON60℃90℃ Package List: 1 x PWM Fan Speed Controller 1 x Buzzle 1 x Probe Package List