Infinity Design: Infinity mirror design case fans provide the visual effect of Infinity at the center and sides of the fan, for a stunning multi-layered effect ARGB Lighting Effects: Addressable RGB lighting on the fan blades and bezel creates a stunning lighting effect for PC cases Optimized Cooling: Nine fan blades with PWM control automatically adjust fan speed for optimal cooling performance. Fan speed: 800-1800±10% RPM Low-noise Design: Hydraulic bearings and eight rubber pads allow for low-noise, stable and durable fan operation. Max noise level: 29 dBA Multi-purpose: 140mm size can be used not only for chassis cooling, but also can be installed in 280mm water cooling system to meet different cooling needs DARKROCK F140 140 mm Case Fan