Features Basic Material: Crafted from premium-grade ABS material, the DC 12V fan speed controller ensures durability and reliability, making it an ideal choice for various PC cooling applications. Sturdy Construction: Boasting a robust design, the PC fan speed governor is engineered to withstand the rigors of daily use and temperature fluctuations, ensuring its quality remains solid and long-lasting, even under demanding conditions. Enhanced Safety: Equipped with built-in overcurrent and short-circuit protection, the PWM fan speed controller prioritizes safety, preventing potential damage to your PC components and ensuring a non-worry user experience. Ease of Use: Featuring a straightforward interface and plug-and-play design, the fan speed controller simplifies fan speed adjustment, allowing users to effortlessly customize their cooling performance without the need for complex configurations. Versatile Application: Widely compatible with a range of 12V PWM fans, the PC fan governor offers broad applicability, making it suitable for use in desktops, servers, gaming PCs, and other electronic devices requiring precise temperature control and efficient cooling solutions. Specification: Note: BF1, BF2 (No.4,5) correspond to FAN1, FAN2 stop alarm function switch. When the corresponding open, the controller will sound (with buzzer needed) and light alarm, fans restored after the alarm is cleared automatically rotated. If BF1 and BF2 are open (ON), the FAN1, FAN2 have any one or two stops, the controller will alarm. Not for: FFR0612VHE, FFR0612DHE, Sizes 6038, Non-standard anti-timing fan (reverse adjust speed) Specification: Board Size: Approx. 5.3*4.5cm/2*1.7inch Positioning Hole Position: 44*37mm/1.7*1.5inch Positioning Hole Diameter: 3mm 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% 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): TP1 TP2 Accelerated Temperature Full Temperature OFF OFF 35℃ 45℃ ON OFF 40℃ 55℃ OFF ON 50℃ 70℃ ON ON 60℃ 90℃ Package List: 1 x PWM Fan Speed Controller 1 x Buzzle 1 x Probe Package List