Special for S21/S21 Pro/S21XP/T21/S19A/AL3/KS5M/KS5L 12V 4-in-1 Square 4Pin Fan Simulator Emulator Fan Spoofer Dummer Calgary SPOT

This speed controller is often used to upgrade the S21/S21 Pro/S21XP/T21/S19A/AL3/KS5M/KS5L air-cooled miner into a water-cooled miner or to install a silencer.
It is a 4-in-1 speed controller, and an S21/S21 Pro/S21XP/T21/S19A/AL3/KS5M/KS5L miner only needs a speed controller.
Is a device that tricks an ASIC miner into thinking its cooling fans are running at the normal speed, allowing for more efficient cooling methods without triggering a safety shutdown or error message.