Features: High-quality material selection, long-life hydraulic bearing Low noise, efficient heat dissipation, creates a quiet environment, simplifies DIY installation Multiple power supply options: USB fan supports various power sources such as mobile power banks, phone chargers, computer USB ports, and more for flexible and convenient use Suitable for routers, set-top boxes, external hard drives, and other electronic devices Effectively reduces equipment operating temperature and helps extend device lifespan with superior heat dissipation Specifications: Material: Plastic Rotating speed: 3000 RPM Sizes available: 8 cm, 12 cm, 24 cm 8 cm: Approx. 8 x 8 x 4.5 cm (3.15 x 3.15 x 1.77 inches) 12 cm: Approx. 12 x 12 x 4.5 cm (4.72 x 4.72 x 1.77 inches) 24 cm: Approx. 24 x 24 x 4.5 cm (9.44 x 9.44 x 1.77 inches) Cable length: Approx. 115 cm (45.27 inches) Notes: 1. Please allow 12 cm variation due to manual measurement. Ensure you are comfortable with this before ordering. 2. Due to differences in monitor displays, the actual item color may vary slightly from the image. Package includes: 1 x Cooling Fan