PROTABLE AIR PURIFIER- Size: 5.7*5.7*7.9 inches. features a three-stage filtration system EASY OPERATE & 4-SPEEDS: One-button operation turns it on/off and controls the fan speed. With 4 speeds: low, medium, high, auto(Automatically adjust the speed according to the degree of air pollution). The low power consumption and low noise make it affordable to run and quiet KNOW YOUR AIR: With an Air Quality Pollution Monitor, WORRY-FREE - If you need any assistance, you can reach our team via chat, email or phone.