Controller
From Amazon
Akasa FC.SIX | 6 Channel PC Fan Controller | Fan Speed Control Front Panel | Suitable for 3-pin/4-pin Fan | PWM Fan Controller | For 5.25 inch PC Bay | Built-in LED Indicator | AK-FC-08BKV2
Conrad Electronic
Akasa AK-FC-08BKV2 PC fan controller (5.25) No. of channels: 6 incl. LED lighting