German Engineering - German Design - German Quality - German Performance Optimized fan blades for the highest performance on radiators and heat sinks Speed switch allows changing maximum PWM speed between medium-speed (up to 1,100 rpm), high-speed (up to 1,900 rpm) and ultra-high-speed (up to 2400 rpm) Small tip clearance and a fan frame with a funnel-shaped air outlet for extremely high air pressure Virtually inaudible operation at regular speed 6-pole fan motor for less vibration and power consumption Fluid-dynamic bearing enables very smooth operation Individual and easy mounting systems for use as a case fan or with a radiator Super-long life-span of up to 300,000h Valuable sleeved PWM cable and easy to install PWM connector Elegant look with high-grade fan sticker in an all-black design 5-year manufacturer warranty