2-in-1 Negative Ion Air Purifier Portable Air Cooler USB Cooling Fan with 3 Wind SpeedGreen Item Type: Air Cooler Material: ABS Voltage: 5V Current: 1000mA Power: 4W Motor Speed: 266-3600 Rpm Ion Concentration: 1x10^6PCS/Cm3 Ozone Concentration: <0.03PPm Water Tank Capacity: 150ml Battery: Polymer Lithium Battery 2000mAh (Included) Charging Time: About 3 Hours Use Time: 8 hours in the 1st gear, 4.5 hours in the 2nd gear, 2.5 hours in the 3rd gear Weight: Approx. 620g / 21.9oz Product Size: Approx. 13x12x12.5cm / 5.1x4.7x4.9in How e: 1. Click the fan button to turn the fan on and off. Click the fan button for the first time to start the fan (default low gear); click the fan button twice to switch to the second gear; click the gear button three times to switch the third gear; click the fan button again to turn off the fan. 2. Long press the fan button to start and close the negative ion work.