SCYTHE KQ01-BK-3.5 Kaze Q 3.5 inch Fan Controller Black Dimensions: 102 x 25 x 93 mm / 4.01 x 0.98 x 3.66 in (WxHxD) Length of Control Dial: 12 mm | 0.47 inch DC Input: 5 V or 12 V (From PC Power Supply) DC Output: 3.7 V (+/-10%) - 12 V (+/-10%) Fan Control Channels: 4 (max. 1 Ampere / max. 12 W)