Air Wick Mist Diffuser, Essential Oils Relaxing Lavender, Gadget and 1 Refill

I see this product comes with a bottle of oil, can it be topped up with your own oils as from reviews im hearing the refills are very expensiv. Thanks

Not sure how you set the time. Switched it on originally, gave one puff and then nothing. Changed to new batteries but same.

How often does spray the mist out

Is the essential oil insert is 100% pure or is it mixed with other substances ? I can not find any info about what is in it .