Amazon.com: PNGKNYOCN 40cm 12V DC 5.5 x 2.1mm to 4-Pin Molex with Switch Power Adapter Cable 1 to 2 Ways, for Molex Case Fans and More (2-Pack : Electronics
Angitu LP4 Molex/IDE 4Pin Switch Cable For Computer Fan LED Strip With On/Off switch - AliExpress