Is a 500ml diffuser big enough for a bedroom?

Yes. 500ml is a large tank for a budget diffuser and typically runs several hours on one fill, which covers a night in a small to medium bedroom.

Does it have a timer or color light?

The listing gives only color, glass material and 500ml volume, so no timer or light settings are confirmed. Assume basic on/off mist unless the seller states otherwise.

Is $9.15 a good price for this diffuser?

It is a low price for a 500ml glass diffuser. It is the only new price listed, at SHEIN as of November 7, 2026, so there is no competing store price to compare against.

Can I use any essential oil in it?

Yes, standard essential oils work in water-based ultrasonic diffusers. Use a few drops per fill and rinse the tank between oils so scents do not mix.

How do I clean a glass diffuser?

Empty the tank, wipe the inside with a soft cloth and a little white vinegar, and let it dry fully. Do not scrub the ceramic disc at the bottom, which creates the mist.