Inline Variable 4Pin Fan Speed Controller for DC5521, 1 drag Control Reduces Repeated Plug Disconnects, Continuously Compatible

Package Contents: Includes 1 fan controller cable with inline variable and off control; the connected fan and power supply are not included Verify input voltage and current for the connected fan or device before use Defined Compatibility: Designed for a DC5521 input and a compatible small 4-pin fan connector in aquarium cooling fan setups or computer case fan modifications; keep the controller away from water and splashes Continuously Variable Speed Control: Turn the inline control knob to set a compatible fan for the needed at the moment without relying on fixed speed steps Tinned Copper Conductor: The cable uses a tinned copper conductor to carry power through the controller while supporting connector-based fan wiring projects Speed and Off Functions: The inline control combines variable speed control with an off position, so the connected fan can be stopped without repeatedly unplugging the power connection