The NF-A20 5V PWM is a special 5-V version of Noctua's award-winning NF-A20 200-mm premium fan, which is controlled via PWM. With its AAO (Advanced Acoustic Optimisation) frame system and advanced aerodynamic design measures such as Flow Acceleration Channels, the NF-A20 achieves superior performance with minimal operating noise. The Smooth Commutation Drive technology and the SSO2 industry benchmark bearing guarantee excellent smoothness and superb long-term stability. The complete package is rounded off by a USB power adapter cable and the OmniJoin adapter set. Note The NF-A20 5V PWM is a 5-V fan and cannot be operated with 12 V. Operation using 12-V power sources such as fan connections for PC motherboards will damage the fan. 5-V version with PWM 5-V PWM fans are used in a wide variety of devices and applications. The NF-A20 5V PWM is a proven premium solution that comes with a USB power adapter cable and an OmniJoinTM adapter set to give you full flexibility in replacing existing 5-V PWM fans as well as in new alternative applications with PWM-based speed control.