Through the heat of vaporization principle of evaporation of water vapor around the same time will absorb heat， rapid cooling effect of strengtheningFan with water vapor， the effect of doubling the cold， you can put ice cubes design， safety soft leaves.Applies to most bicycle water bottle holder and car cup holder and fitness equipment， etc.， can also be accommodated in mountaineering bagsAny outdoor activity， whether playing， running， fishing， walking the dog， hiking， barbecue， camping， watching various sports competitions， you can use itPower Supply: 2 x AA Batteries (Batteries are not included)Material: Bottle: PVC， ABS Nozzle: High-density Material HDPE， PPSize: 26.5 x 9.5cm / 10.43 x 3.74 "(L x W)Diameter: 6.5cm / 2.56 "Note: Colors are sent randomly. If you buy more than one， perhaps you will receive all the same colors. Hope you can understand.Weight: 180g (excluding water and batteries)Package includes:1 × Water Fan (Send by randomly)1 x Screwdriver