How does a ceramic diffuser differ from a plastic one?

The body is glazed ceramic rather than molded plastic, so it feels heavier and looks more like a vase or lamp. It does not change how the ultrasonic mist works; the trade-off is weight and the risk of chipping if dropped.

Does it need heat or a candle?

No. It is an ultrasonic diffuser, so a small plate vibrates the water and oil into a cool mist. That means no flame and no hot element, and the scent is not altered by heat.

What size room is it for?

It is a compact unit, so it works best in a bedroom, office or bathroom where the mist can build up. In a large open room the scent will be faint unless you sit close to it.

Can I use it with essential oil blends?

Yes, it is made for essential oils and blends added to water in the tank. Follow the dilution guidance on the oil you use, and clean the tank between different scents so they do not mix.

How often do I need to refill and clean it?

Expect to refill after a few hours of running, since the tank is small. Empty leftover water and wipe the tank every few days to keep mist output steady and prevent residue buildup.