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Q2: Is it possible to buy samples to test before a MOQ order ?Yes, of course you can.Q3. Is your essential oil harmful to health ?No, all our essential oils are refined and extracted in strict accordance with the standards of the fragrance association, and wepassed the ROHS (International Environmental Directives) and REACH (163 tests on human hazardous substances).Q4 How long for warranty period ?All our products are 1 year guaranteed. You can contact with us in case any parts are damaged, we'll work out the resolution at our soonest.Q5.How to maintain the atomized head parts ?A New atomized head part will be attached for replacement. If the atomized head part is blocked, you can place the new one and put the old one in the alcohol to decompose the dirt. It's better for the atomized parts be replaced once a month.Q6. Is your 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 the machine ?1. Take out the bottle.2. Fill some alcohol with the bottle and clean the bottle.3. Refill the fresh alcohol and install it to the machine, open the power to work.4. After 10 minutes and it is finished cleaning, turn off.5. Put the essential oil bottle inside the machine, close it well.