Comfort Zone - 4&quot; USB Desk Clip Fan, Green - Dual Power Operation: USB Powered &amp; Battery Powered (4xAA Batteries). 360 degree adjustability to any angle! Use anywhere, with or without a computer! Compact and adjustable base for desktop use. Strong clip for use in work &amp; hobby areas. Use in car with car adaptor (sold separately) . Perfect for campus libraries and study areas . Single Speed Setting with LED power indicator. Works with 5v AC adaptor (not included).