Highly flexible premium grade 8-way PWM fan hub for 5V, 12V, and 24V based 3-pin and 4-pin fans (PWM control on 4-pin only), advanced protection against inrush currents, transients and overcurrent 4-pin input for power, PWM control (e.g. via optional NA-FC1 fan controller or PC motherboards) and RPM monitoring, 5.5/2.1mm (OD/ID) barrel input for power (e.g. via optional NV-PS1 115/230V PSU) Up to 60W total when powered via the 5.5mm barrel connector using optional power supplies (up to 24W using the Noctua NV-PS1), up to 22W when powered via the 4-pin input Easy installation with magnetic fixture and screw-holes (4.1mm diameter), removable clip-on cover for applications where status LEDs should not be shown or extra protection against dust is required Full compliance with all applicable safety standards (EN 62368-1, EN 55035, EN 55032, UL-62368), CE, UKCA and UL certification, renowned Noctua quality backed up by a 6 year manufacturers warranty