Air Extracting Laptop Cooler, KKmoon USB Notebook Vacuum Fan Low Noise LCD Display Speed Adjustable with Rotatable Knob Intelligent automatic mode and manual mode to meet your different requirements, more choices. LCD display provides two switchable display modestemperature and fan speed by pressing MODE button for 2 seconds. A rotatable knob to adjust the fan speed, very flexible. Four silica gel connector, compatible with all notebook outlet. USB interface 5V power supply is more convenient and reliable.