4pin ATX fan speed simulator

4P big square head fan speed simulator is suitable for Whatsminer M32 / M32S / M21S / M30S / M31S / M50S or any other miners with pulse wave modulation (PWM) cooling fans. It is suitable for all miners with PWM 4-pin fan. Its chip artificially generates a 2200~6500 Fan RPM signal back to the miner's control board. It can work under 5~36V. Please explain the model of the miner to the salesperson before purchasing.