#1 What is the recommended temperature range for using this appliance?
This appliance should only be used in rooms with temperatures between 4.44°C and 43.33°C (40°F and 110°F).
#2 How long can the filter be used before needing to be replaced?
The filter can be used for 2000 hours before the built-in sensor alerts you with a red indicator light, indicating it’s time to replace the filter.
#3 How will I know when it’s time to change the filter?
When the filter has been used for 2000 hours, the built-in sensor will alert you by turning on a red indicator light, signaling that it’s time to change the filter.
#4 How to reset light after After replacing the filter element?
After replacing the filter element, long press “ Reset Button” button 2s, the buzzer rang twice, and the lamplight at the top resumes blue, filter successfully opens a new timing reset. See at page 4 https://manualsfile.com/product/k4ywxx646gp.html#p4