Note: Please note that the controller is a four-wire PWM fan controller can control four-standardized protocols in line for Intel's four-wire fan (all four lines of the chassis and CPU fan are met, a server with more than 97% can control fan violence). Unable to control two-wire or three-wire fan, you can not completely turn off the fan! 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: Delta FFR0612VHE, FFR0612DHE, Dimensions 6038, Non-standard anti-timing fan (reverse adjust speed) Features: Accurate temperature setting and precise control. The controller only controls the speed of the all standard four-wire chassis fan and CPU fan for Intel. 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. 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. Specification: Board Size: Approx. 5.3*4.5cm/2*1.7inch Positioning Hole Position: 44*37mm/1.7*1.5inch Positioning Hole Diameter: 3mm 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. 1 7g / 0.6oz Function Setting Switch Description: (Any changes to the setting must be repo wer ed to start before it takes effect) TFL (No. 1): PWM channel with the lowest te mperature 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 tempera t ure 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