Features: High-quality material selection, long-life hydraulic bearing Low noise, effective heat dissipation, creates a quiet environment, simplifies DIY installation Multiple power supply options to meet various needs. The USB fan supports different power sources for flexible and convenient use: mobile power bank, phone charger, computer USB port, etc. Suitable for routers, set-top boxes, external hard drives, and other devices Helps reduce equipment operating temperature and extends device lifespan with efficient heat dissipation Specifications: Material: Plastic Rotation 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 Note: 1. Please allow 1–2 cm variation due to manual measurement. Ensure you are comfortable with this before ordering. 2. Due to differences in monitor displays, the actual product color may vary slightly from the images. Package includes: 1 x Cooling Fan Set