2/4/8H Timer Set a timer for 2, 4 or 8 hours to perfectly fit for your schedule. Maintain powerful purification when necessary, and save energy when sleeping or going out. Filter Change Reminder The Display/Filter button, with its red button light, reminds you the time to change filter after 3-5 months of use, depending on your usage. Search for 'B09R1NNPJV' for purchase of official filters. 3 Fan Speed Comes with 3 adjustable fan speed settings from Low, Medium to High, to find your optimal fan speed to tackle different purification needs.
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