Dimensions: 120x120x25mm / 4.7 x 4.7 x 1 in per fan. Totally 240x120x55mm / 9.45in x 4.72in x 1.97in. Dual 120mm usb fans compatible for various electronics and components cooling. A speed controller with three gears(Low, Middle and High), which is specially designed to control the airflow levels. Meet your different needs. Rated Voltage: DC 5V; Rated Current: 0.69Amp; Rated Speed: 2000 RPM; Air flow: 2X 73.8CFM; Noise:29.6dBA Hydraulic bearing have a lifespan of 40,000 hours at 25 degrees and allows the fans to be laid flat or stand upright.