- How long does a 120 mL tank last?
- Expect roughly 3 to 5 hours on continuous mist and longer on intermittent settings. A 120 mL tank is small, so refill it before a full night.
- Is it good for a bedroom?
- Yes for a small bedroom, since ultrasonic mist is quiet and the output is modest. For a large room, a bigger tank will run longer between refills.
- Does it need distilled water?
- Distilled or filtered water is the safer choice. Tap water leaves mineral film on the ultrasonic disc and the glass over time.
- Can I use it without essential oil?
- Yes. Run it with water alone as a small humidifier, or add a few drops of oil for scent.
- What is in the box?
- Typically the diffuser base, the green glass cover, and a power adapter. Check the listing for the exact adapter and any measuring cup.
- Is $28.99 a good price?
- It is the only new price listed as of November 7, 2026, so there is nothing to compare it against. Small glass-cover diffusers commonly sell in the $25 to $40 range.
- Where is the 120 mL Ultrasonic Essential Oil Diffuser with Green Glass Cover cheapest?
- At Walmart, for $28.99, as of our latest check.
