Features: Brand new and high quality Suitable for USB power desk fan,USB ceiling fan, USB LED light and more USB power devices. USB switches extension cable with speed regulation function and brightness adjustment function. With its upgraded design, this cable features power switches that prevents USB port from get worn out. Strong component ensures strength and durability for long usage. Switches with knob. Brightness can be adjusted arbitrarily. Suitable for LED light. Specifications: Material:Plastic Color:Black/White Length:Approx.27cm/10.63inches Package Includes: 1Pc LED Knob Dimmer note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.