PNGKNYOCN 40cm USB to Dual 3-Pin / 4-Pin PWM 5V USB Sleeved Fan Power Adapter Cable, with ON/Off Toggle(2-Pack) by Amazon.co.uk

• usb to fan adapter cable is suitable for all 4-pin and 3-pin case fans.

• Use the usb power connector to run 2 pcs PC case fans at 5V voltage at the same time. Note: It has no PWM speed measurement function.

• Connector A: USB Male, B: 3x fan connectors (Actually only 2 pins are energized).

• Molded plastic rocker switches can quickly and comfortably turn your fan on or off.

• Fan must have a start voltage at or below 5V (Fans with higher starting voltage will not work properly)