Features: OOTDTY brand new and excessive quality. With stepless speed management knob, it can be adjusted or closed. Adjustment The use of thickened cord is safer and more stable. It is used for smooth bulb dimming, aeration to adjust air volume, water to adjust water volume, fan to adjust wind speed, heating plate to adjust heat, equipment to adjust power, motor to adjust velocity and so on. Specifications: Material: Electronic Component Weight: 15g Size: 50x19x23mm/1 Color: Black Working Control Current: 1-4A Adjustment Rated Current: 4A Package Includes: 1x Speed Controller Note: 1 allow 1-2cm mistakes because of manual measurement, make sure that you do not intellect earlier than you order. 2 to the difference between various monitors, the picture will not mirror the actual coloration of the item.