Purification with negative ions Three adjustable purification modes With bass function, no noise when working Activated carbon filtration Adopting professional filtration and sterilization technology to of your family's health. FUNCTION OPERATIONBUTTON M FUNCTION: Click the " M " button for the first time to turn on the automatic mode. and t he fan willautomatically switch gears according to the air quality; Click the " M " button a second time to start manual mode one gear , Click the " M " button a third time to switch to manual mode second gear Click the " M " button forthe fourth time to switch to manual mode third gear Click the " M " button for the fifthtime to turn off the machine Negative ion function: Long press the " M " button for thefirst time to turn on the negative ion; Long press the " M " button a second time to turnoff the negative ion; Night light function: Double-click " M " for the first security checkto turn on the night light Double-click the " M " security check for the second time , turnoff the night light size: 16 x 16 x 26.8cm Material: ABS colour: grey Package Contents: 1 x Purifier 1 x Data Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.