Use air dynamics wind tunnel to accelerate air circulation and create a healthy home environment to create a healthy home environment The reverse spiral grids prevent the hand from the hand unexpectedly Anti-propeller turbofan blades. Acoustic noise reduction structure Built-in DC brushless motor, good performance 5 gear adjustable, air volume optional order of priority 115° left and right rotating, 115° up and down manual adjustment Type-C charging port, used with computer/power bank/vehicle Specifications: Rated Input: 5V=1A Product Weight: 800g Battery Capacity: 4000mAh Product Size: 202.5 x 170 x 276mm Standard: GB 4706.1-2005; GB 4706.27-2008 Package included: 1 x Cooling Fan 1 x Charging Cable 1 x English and Chinese Manual Other items not included