Features: Brand new and high quality High-quality material selection, manufacturing with hydraulic bearings for long life Low noise, heat dissipation, creates a quiet environment, making DIY so easy Multiple power supply modes meet the requirements. The USB fan supports a variety of power supply modes, and DIY is more relaxed and convenient: mobile power supply, mobile phone charger, computer USB interface, etc. Suitable for all types of routers and set-top boxes, mobile hard drives, etc. It can reduce the equipment's working environment temperature and extend the equipment's life because it has good heat dissipation. Specifications: Material: Plastic Rotation speed: 3000RPM Size: 8cm/12cm/24cm 8cm: Approx. 8x8x4.5cm/3.15x3.15x1.77inch 12cm: Approx. 12x12x4.5cm/4.72x4.72x1.77inch 24cm: Approx. 24x24x4.5cm/9.44x9.44x1.77inch Cable length: Approx. 115cm/45.27inch Note: 1. Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 Set Cooling Fan