Dual 120mm fans designed for Cooling Cabinet, Chassis, Server and Workstation Powered by wall outlet; The speed controller designed to set the fans' speed to optimal noise and airflow levels. 4V - 12V Power Control Input: 100V - 240V 50/60Hz Output: DC 4-12V 200-2000ma Total Airflow: 186CFM(2x 93CFM) Total Noise: 38dBA Current: 0.5Amp Dual Ball Bearings, Working up t 50000 hrs at 25 degrees. Dimensions: 4.72in(L) x 4.72in(W) x 1in(H) in per fan. Totally Size: 9.45in(L) x 4.72in(W) x 1in(H)