The device designed for all users of notebook computers. Built-in large quiet fan highlighted in blue. A separate button for switching on and off. Additional knob to adjust the airflow rate. Suitable for any size computer from 12 'to 17.3'. All this is powered by USB cable - requires no external power supply. Lightweight and durable construction of plastic with metal grille is very resistant to falls and easy to carry with a laptop. Additional USB port to power small devices. Ability to set a laptop on a higher elevation for better posture while working.