Features Low Noise Design: The synchronous rectifier converter design eliminates the need for a heat sink under high current , providing glossy direct current output, resulting in minimal noise and smooth . Wide Fan Compatibility: Supports all 12V 5A fans, including brushed DC motors, water pumps, and light bulbs, allowing multiple fans to work in parallel without exceeding high currents. Manual Speed Control: Easily adjustable through the on-board adjustable resistance, giving you full control over the fan speeds. 4 Temperature Zones: Equipped with 4 temperature zones for automatic temperature control and variable speed function, ensuring regulation based on environmental conditions. Work Monitoring Function: Features a channel work monitoring function, supporting stop monitoring alarm and ble/visual alerts for speeds lower than 450 rpm, ensuring efficient and reliable performance. Specification: Item Type: DC Speed Controller Material: Plastic Working Parameters: 12V 5A Board Size: Approx. 50 x 48mm / 2.0 x 1.9in Package List: 1 x DC Speed Controller Note: Product with Temperature Probe and Buzzer, No Need to Purchase Separately Package List 1 x DC Speed Controller