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Replace filter element: On average, the filter should be replaced every 3 months, the air filter may need to be replaced sooner or later depending on the air quality in your area. Product structure ·Primary filter, true HEPA filter, Carbon filter and Negative ion generator are important parts in our air purifier. Four million negative ions are released every second. The 4-in-1 air purifier, along with air booster system, can clean and absorb the pollutant in the air up to 99% and generate negative ions into the air. Let the air fresher and healthier. ·There are sleep mode, auto mode and high speed mode. When in sleep mod or auto mode, the anion generator is activated, but the anion generator is turned off when in Spray mode. ·Our air purifier are connected power supply through USB cable. Although the effect is not obvious, you will feel that the air changes after your your patient time. Product Specification: Input Voltage: DC 5V Working Current: 0.1A Working Power: 0.5W Negative ion: 4 million/s Max fan speed: 2800 rpm Purify air volume: 51~150m³/h Outstanding Features ·Eliminate 99% pollutant: Intercept particles as fine as 0.3 microns, such as PM2.5, sterilization, pollen, haze, dust, pet dander and so on. Remove odor, such as smoke and methanol. ·Quiet Operation: A volume as low as 30 decibels, don’t disturbing your sleep. ·3 working modes for choice: sleep mode, auto mode and high speed mode ·Four million negative ions are released every second Replaceable Filter: For your best using experience, you should change every 3 months or when the filter stink. You can buy it on Amazon too, search our brand and you will see. Buyer Assurance We all focus on your experience. If you have any problem or advise , welcome to leave us a message. Your suggestion will be a valuable upgrade for us ,and replied in 24 hrs and give you the best solution.