Roughing it isn't what it used to be! Coleman® Cool Zephyr fan attaches to tent windows to bring fresh air in or pull stale air out. Special magnetic plate included attaches unit to any tent window or stand the fan on legs built into the magnetic plate. Two speed air control lets you set the amount of flow within tent, trailer or motorhome to your liking. Install the fan inside the tent to pull in fresh air install it outside to remove stale air. Soft, pliable fan blade enhances safety. Approximate run time is 20 hours on high and 40 hours on low using six D size batteries battery pack included, but not the batteries.