Features: Brand new and high quality Miner change water cooling, silencer, muffler, oil cooling necessary, fully simulate 570~7200 speed. Four lines, 4 pins, support PWM speed regulation, voltage 5-20v. Fan Simulator compatible with WhatsMiner M30S M31S ATX 4pins interface. In 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. Specifications: Material: PCB Interface: 4Pin Note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment. Package includes: 1PC x Fan Simulator