"Specific Information:Miner change water cooling, silencer, muffler, oil cooling necessary, fully simulate 570~7200 speed, four lines, 6 pins, support PWM speed regulation, voltage 5-20v.Fan Simulator compatible with WhatsMiner M30S M31S ATX 4pins interfaceIn theory, as long as the fan can recognize, Fan Simulator can be used. Note: Most machines will detect 2 fan, so it is best to buy two at a time. In addition, the fan simulator only fooled the machine, Simulated fan presence, the heat dissipation of the machine still needs other ways, such as watercooling, such as centrifugal fan.Package:1 x Fan simulator/Spoofer/removerNotice:1. Due to different measurement methods, the measurement allow about 2-3cm error. This situation is not a quality problem. (1 inch = 2.54 cm)2. Due to different lighting and screens, the color of the product may vary slightly from the original color. Please prevail in kind."