The DELTA PRODUCTS EFB0405VHD is a compact and reliable DC fan designed for efficient cooling in various electronic applications. Featuring a durable ball bearing design, this 5V fan operates within a voltage range of 4.5V to 5.5V. With a size of 40mm x 40mm x 20mm, it can easily fit into tight spaces while delivering a high airflow of 10.1 cubic feet per minute (CFM). Despite its powerful performance, this fan operates quietly at a noise level of just 32.5 decibels (dB). Trust the DELTA PRODUCTS EFB0405VHD to provide optimal cooling and ensure the longevity of your electronic devices.