1LOW NOISE: The DC speed controller adopts the design of synchronous rectifier converter, no need to add a heat sink under high current operation, the output is glossy direct current (no pulse), direct drive output design, low noise 2FANS within 12V 5A: The DC speed controller can support all fans within 12V 5A, including brushed DC motors, water pumps, light bulbs, etc. Multiple fans can work in parallel under the premise of not exceeding large currents 3MANUAL SPEED CONTROL: The DC speed controller can be adjusted manually by turning the adjustable resistance on the board 44 TEMPERATURE ZONES: The DC speed controller has 4 temperature zones automatic temperature control and variable speed function, which will automatically take effect after plugging in the temperature control probe 5DIFFERENT SPEEDS: The DC speed controller will work at a low speed at the manually adjusted speed when the temperature control is working, while the high speed is 12V straight through, and the speed in the middle of the temperature zone will change linearly 6WORK MONITORING FUNCTION: The DC speed controller has a channel work monitoring function, which can support a stop monitoring alarm with a speed line (such as a three wire fan), and an audible and visual alarm when the speed is lower than 450 rpm Package List 1 x DCSpeedController