This personal neck cooling system in the form of a collar that hangs around your neck. Pour a few ounces of water, switch it on an its tiny, quiet motor will fan cool vapors onto your neck giving the blissful relief from the heat up to 4 hrs. The kit comes with a 2oz water bottle for quick refilling. The device weighs only 250 grams and runs on one AA battery so carrying this mini neck cooler won't be an issue.