Product description Attention Please 1. Please keep remind to add pure water, to Avoid Impurities affecting the cooling function. 2. Use Cup brush or toothbrush clean the water tank once a week. 3. If you would like to enjoy cooling wind you can ice cube in the water tank. 4. When have water in the tank,please keep it level,remember to move in paralle,don't lean it . 1.Multi-functionPersonal USB Fan,Air Humidifier,Air Purifier 3 in One Multifunction Design. Cools, Humidifies and Purifies for Better Air,Keep You Away from Dry Air,Enjoy Your Cooling Summer. 2.Energy Saving Use Newest H2O Cool Fusion Technology & Evaporative Technology, Draw in Hot Air and Pass it Through a Wet Filter, Then Exits Cool Wind the Other Side. The Built-in Water Tank Can Blow Cool Wind 5-7 hours.Freon Free, Energy Efficient & Eco-friendly. 3.Portable and Easy Use Powered by a USB Cable,Portable and Compact, Perfect to Use Around Your Kitchen, Office, Dorm Room, on Your Desktop Top and Next to Your Pets, Ideal for Traveling and Camping. 4.Personal Air CoolerMini Personal Space Evaporative Cooler Designed for Individual Use, It Does not Use Refrigeration or Chemicals to Cool the Air, So You Should not Expect the Same Results as an Air Conditioner,Lets You Create Your Own Personal Comfort Zone. 5.Use TipsWhen the Water Tank is Filled with Water, Please Move it in Parallel,Don't Lean It,In Case the Water leakage. Three wind speeds (high, medium, low) can be set. You can choose the most suitable one for your leisure time, sleep or work time. Package include 1* Portable Air Cooler 1* USB cable(Adapter not include) 1* Use Manual