AC Infinity MULTIFAN S2, Quiet 120mm USB Blower Fan with Speed Control, for Receiver DVR Xbox Modem AV Cabinet Cooling Quiet blower designed to be placed on top of various electronics to draw out heat. Features a multi-speed controller to set the fans speed to optimal noise and airflow levels. Low profile design pushes air out the rear, ideal for applications with limited clearance. USB plug can power the through through USB ports found behind popular AV electronics and game consoles. Blower Size: 4.7 x 4.7 x 1 in. | Airflow: 35 CFM | Noise: 17 dBA | Bearings: Dual Ball