Zalman ZM-MFC1 6-Channel Fan controller for 5.25" Bay Product Type - Fan Four channels: Speed adjustment of 3-pin connector type DC fan with the fan speed control knob Product Type - Replacement Lamp Output Voltage Distortion - Less than 5% at full load Output Frequency (sync to mains) - 47 - 53 Hz for 50 Hz nominal,57 - 63 Hz for 60 Hz nominal