Better than a fan, these portable air coolers have a water evaporating cooling system that blows out refreshingly cool air. These electronics work anywhere - on a desk, kitchen table, nightstand - even in your car or boat. Simply fill with water and turn it on. No installation required. Cools the air around you for up to 5 continuous hours per water change. Lightweight and portable, the 6 1/2" x 7 1/4" cooler features a low and high setting for customized air flow. Uses 4 C batteries or an AC adapter (neither included).