Main Features: Wide angle air supply, 60 degrees automatic shaking head, up and down 27 degrees manual adjustment 12 hours of continuous air supply 3 speeds to choose from Removable front net for easy cleaning Material: ABS and PC Charging time: about 6h Working time: about 3 - 12h Battery capacity: 4000mAh Output power: 5W Input charging current: DC 5V / 0.8A ""A casing cooler fan is any fan inside, or attached to, a computer case used for active cooling. It used to draw cooler air into the case from the outside, expel warm air from inside and move air across a heat sink to cool a particular component.