AC Infinity MULTIFAN S7 is a dual 120mm USB fan designed for cooling receiver electronics. It features a dual ball bearing system for long-lasting performance and quiet operation. The fan has a voltage range of 3-6.5V and is powered by a USB connection. With a compact size of 4.75" x 4.75" x 1.8", it is easy to install and fits most computer cases. The black color and sleek design make it a stylish addition to any setup.