Features: Adjustable 12V 3A dimmer switches with 5.5x2.1mm connectors offers precise speed control for cooling fan, blowers, and exhaust systems. Features 140cm total wire length (18cm input/115cm output), blue LED power indicator, and universal 5.5x2.1mm male/female connectors for integration. for PC enthusiasts, DIY builders, and industrial setting requiring customizable airflows. Optimizes cooling efficiency in computer setups, ventilation ducts, or air circulating cushions with smooth 0-12V output adjustment. plastic construction and center positive polarity ensures performances across 12V 3A devices like blowers and exhaust fan. Specifications: Material: Plastic + Metal Size: 7.2x3.5x2.2cm/2.83x1.37x0.86inch Input line length: 18cm, output line length 115cm Package Includes: 1PC 5.5x2.1mm 12v 3a Speed Regulator note: Please allow 0-1cm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the Pictures may not reflect the actual of the item.