The MULTIFAN S4 is a quiet 140mm USB cooling fan by AC Infinity, designed for use with receivers, DVRs, computers, and Xbox cabinets. With a maximum airflow volume of 57 CFM and a fan speed of 1200 RPM, it effectively dissipates heat and keeps devices cool. Featuring a dual-ball bearing type for durability and a sleek black color, this USB fan ensures reliable performance with a manufacturer warranty of 2 years. Its compact size of 5.7" in length and height makes it easy to install in various electronics without taking up much space.