Zalman ZM-2HC2 HDD Cooler Product Type - HDD Cooler Product Material - Aluminum, Copper, Rubber Dimensions WxDxH - 146.5 (W) X 143.5 (L) X 36.5 (H) mm 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