O2 Cool fans offer a variety of portable fans that can be operated via USB, battery or AC adapter. These are excellent fans for camping and come in a variety of sizes from slim compact models to 10 inch fans with powerful airflow. The USB fan comes in many colors and is compact and will easily fit well in any bag and at the campsite. Some of the O2 Cool Fans come in 5 inch and 10 inch and are battery powered, offering great airflow and is a perfect fan for inside your tent. The new 5 inch clip fan is battery powered and can hook on to multiple surfaces making it useful in a variety of situations. If you are looking for some serious airflow the tower-misting fan is battery or AC adapter powered and can really move air in a small area. It also has the ability to mist, which is great at the campsite to stay cool. The newest addition of 02 Cool fans is the smart power it is operated by battery or AC power but also has a built-in rechargeable battery with USB power port.