The NA-FC1 is a compact, highly flexible controller for 4-pin PWM fans that can both work on its own for manual speed reduction and also work in tandem with the automatic motherboard fan control. By adjusting the NA-FC1s speed control dial, users can either manually set a PWM duty cycle from 0 to 100% or reduce the PWM duty cycle supplied by PC motherboards in order to have the fans running slower than the automatic motherboard fan control would allow. While the brightness of the orange status LED provides visual feedback on the current dial setting, the push button allows the NA-FC1 to be switched into no stop mode, which prevents the fan from falling below a speed of 300rpm. Thanks to the supplied 3-way split cable and power supply adaptor, up to 3 fans can be controlled simultaneously.Features:PWM based controlWhile most fan controllers are voltage based, the NA-FC1 uses the more sophisticated Pulse Width Modulation (PWM) technique that allows for more efficient control and lower minimum speeds, regardless of the fans starting voltage.Manual control modeIf the NA-FC1 doesnt receive an input PWM signal from the motherboard, it works as a simple and efficient manual controller that allows the duty cycle to be set from 0 to 100%. This makes it ideal for manually slowing down high-speed PWM fans such as Noctuas industrialPPC series in order to achieve consistently quiet operation.Customising motherboard fan controlMany motherboards provide insufficient options to customise automatic fan control or simply dont go below certain duty cycles and speed levels. Using the NA-FC1, you can lower the motherboards PWM control curve in order to achieve truly silent operation, even with high-speed PWM fans such as Noctuas industrialPPC series.No stop modeIf the small push button is pressed and the green status LED is on, the NA-FC1 operates in no stop mode, which means that it will not allow the fan to fall below 300rpm, regardless of the speed setting and the input PWM duty cycle from the motherboard, thus avoiding BIOS fan errors.*3-way splitter cableThe supplied 3-way splitter cable allows the connection of up to three 4-pin PWM fans in order to control them simultaneously. Even more fans can be controlled at once when using additional NA-YC1 splitter cables that are supplied with many Noctua fans and available as an optional accessory kit (NA-SYC1).Power supply adaptorAs powering multiple higher wattage fans from a single motherboard fan header may damage the motherboard, the NA-FC1 includes an NA-AC4 adaptor that powers the device directly from the power supply unit while simultaneously receiving PWM input from the motherboard and forwarding RPM information. This makes it ideal for controlling multiple high-speed fans such as Noctuas 3000rpm industrialPPC models.6-year manufacturers warrantyNoctua products are renowned for their impeccable quality and outstanding longevity. Like all of them, the NA-FC1 fan controller is built to last and comes with a full 6-year manufacturer\'s warranty.Specification:- Connector: 4-Pin- Voltage Range: 5-12 V- Colour: black- Size: 21 x 25 x 48 mm- Weight: 35 g- Fan compatibility: all Noctua 12V PWM and 5V PWM fans, many third party PWM fansContents:- NA-FC1 controller- NA-SC1 3-way splitter cable- NA-EC1 input cable- NA-AC4 input cable with power supply adaptorWarranty 6 years