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Check the listing for details. DC 12V PWM PC CPU Fan Temperature Control Speed Controller Board 5*4.3cm NEW. Condition: New. Listed at 2.83 USD. TFL (No. 1): The lowest temperature channel PWM setting, when ON state FAN1 PWM minimum is 40%, when OFF the minimum PWM of FAN1 is 20%. Support all within 12V 5A fans, synchronous rectifier output, high efficiency!