When the SLEEP and ON/OFF buttons are blinking, it is the filter indicator reminding that the filter may need to be replaced. If the filter can still help to maintain an excellent air quality, please reset the filter indicator directly by pressing and holding the SLEEP and ON/OFF button until the device beeps three times. Otherwise, please reset the filter indicator after the air filter has been replaced. Details of the filter indicator is written on user manual of YIOU Air Purifier R1. Any questions please feel free to contact us.
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