【Functions】 1. Full-featured and powerful, can be used as a fan can also be used as a humidifier. 2. The negative ion fan has its own night light to accompany you to sleep safely at night. 3. The portable air cooler is easy to carry. No matter where you go, it won't be difficult to take it with you. 4. The design of high speed and low noise will not affect your work or sleep. 5. Negative ion air cooler, bring you clean air, improve your air environment, and improve your body at the same time. 6. Energy-saving, USB charging, will greatly save your electricity costs. 7. Long-lasting cooling, only need to add water once, can lasting cooling for 8 hours. How to Operate The Evaporative Air Cooler& Portable Air Conditioner 1st : Open the water tank and add water. You can add ice water, ice cubes too. Notice: Don't exceed the maximum water level. 2nd : Insert the power supply with USB charger. 3rd : Press the power button to start this device. By pressing the switch on the back of this device, you can select different modes. You can select the LED mode only. 【Product Parameters】 Material: ABS Weight: 700G (1.5lb) Current: 300mA Water tank capacity：150ml Negative ion working power: 1W Ion concentration:1×10 PCS/cm3 Ozone concentration :<0.03 PPm Product Size: 151×150×171 mm(5.9’’×5.9’’×6.7’’)