essential oil able to be refilled? Is it harmful to people? Yes, the essential oil can be refilled. But only PURE Essential oil can be used,water can not be add into the machine. It is notharmful to people.Q7. Is your Electric Scent Diffuser able to set work ? Yes, you can set working intervals and stop intervals, like 30 seconds on and 30 seconds off from 9 am to 6 pm everyday.Q8. How to clean t
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