The Treva by O2COOL 10-Inch Smart Power Fan is packed with useful and convenient features. It’s perfect for indoor and outdoor activities and with multiple power sources you can be sure that there’s always cooling air. The compact design makes it easy to take it anywhere. It’s great for use in a hot office or classroom. Use it on a picnic, camping or during a power outage. It features two powerful speeds that deliver cooling and refreshing air. With Smart Power technology it automatically operates using the lowest cost power option to save you energy. MORE ABOUT THIS PRODUCT: Smart Power Technology Saves Energy Power Sources: plug-in with the AC or DC Adapters (included), Use 8 D-Cell Batteries (not included), or use built-in rechargeable batteries Powerful 2 Speed 10-inch Blades USB Power Port For Charging Your Cell Phone or Mobile Devices Convenient Flip-Up Handle Stable Base with Stabilizing Feet Tilts for Directional Air Flow Compact Design Makes it Great for Travel Perfect for Camping and Outdoor Activities Ideal for Power OutagesREFRESHING AIR ANYWHERE! Stay comfortable with the help of this mini desk fan. It features a USB power port that allows you to charge your cell phone and other mobile devices. Set up your own personal cooling system on your office desk. It provides refreshing air in a tent or car. The flip-up handle at the top makes it easy to carry and it features removable feet so you can set it on flat surfaces. ABOUT USTreva is your go-to for personal comfort products. All of our high-quality fans and other items work to keep customers comfortable regardless of the season or reason. Our name means “home by the sea, ” because all of our products are as comfortable as an ocean breeze. Whether they’re battery-operated or USB-powered they get the job done.