The first invention (remote control) of wireless fan speed control in the world. Fully control up to 4 fans at the same time (case fans, CPU cooler or VGA cooler). Thermaltake first-class "TRT" (Thermaltake Remote Technology) inside Long-range Remote Control approximately 12m in open space. Color LED fan speed display. 6 LEDs with 3 different color. Wide receiving angle. Efficiency or silence, it's up to you. Simple installation and operation. With convenient key ring holder. 3 Color LED (BGR) Fan Speed Speed Display: Each push the + or - button, the color LEDs will light on gradually between blue light and red light. The first blue LED light means most silent mode, the six red LED light means full speed mode.