Effective cooling: Reduces temperature by about 20 degrees Celsius for optimal performance. Quick cooling: Fan speed of 1800 rpm ensures fast and efficient heat dissipation. Silent operation: Noise level of only 18 decibels for completely quiet heat dissipation. Stable installation: Rubber shock-absorbing feet alleviate resonance and ensure stable mounting. Energy-efficient: Ultra-low energy consumption for maximum heat dissipation without high power usage. Item Name: Cooling Case Fan Material: pbt Speed: 1800 Interface: USB (5V) Working Decibel: about 18 Decibels Air Volume: 56cfm Features: Temperature Reduction, USB Power, Compact Size Details: Single Layer, L: 12cm/4.72", W: 12cm/4.72", H: 5cm/1.97" (Approx.) Dual Layer, L: 24cm/9.45", W: 12cm/4.72", H: 4cm/1.57" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Cooling Case Fan