How long does one fill last?

The 300 mL tank typically runs a few hours on lower mist settings and less on the highest stage. Expect to refill it most nights if you run it all evening.

Can I use it without the light on?

Yes. The light settings are adjustable and can be turned off entirely, so you can run mist only in a dark room.

Does it turn off by itself?

Yes. It shuts off automatically when the water runs low, which protects the unit from running dry.

What do I need to add besides water?

Water plus a few drops of essential oil or fragrance oil. The diffuser and an AC wall adapter are included; it runs on corded electric power.

Is it good for a large living room?

It is better suited to a bedroom, office or other small room. A larger space will dilute the scent, and the small tank limits long runs.

How does it compare with pricier diffusers?

It covers the basics: cool mist, adjustable output, a light and auto shutoff. Pricier models add timers, app control and larger tanks, which this one lacks.

Mainstays Ultrasonic Cool Mist Essential Oil Diffuser

Best price now

$26.00at WalmartChecked 20 h ago

Prices are checked against each store and labelled with when.

Visit Walmart

Mainstays Ultrasonic Cool Mist Essential Oil Diffuser

Best price now

$26.00at WalmartChecked 20 h ago

Prices are checked against each store and labelled with when.

Visit Walmart

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Price facts

Last seen at $26.00 at Walmart on Nov 14.

Our take on the Mainstays Ultrasonic Cool Mist Essential Oil Diffuser

The Mainstays Ultrasonic Cool Mist Essential Oil Diffuser is a basic corded diffuser with a 300 mL reservoir that runs on ultrasonic mist. It offers four mist output stages and adjustable light settings, including the option to turn the glow off, plus automatic shutoff when water runs low. It suits shoppers who want simple room fragrance and a soft night light without smart features or a large tank. Against pricier rivals it gives up app control, timers and a bigger reservoir, but owners rate it well as an easy, low-commitment starter diffuser.

Best forSmall bedrooms and officesBuyers wanting a cheap first diffuserUse as a soft night lightAnyone who prefers simple dial-style controls

Pros

Four mist stages let you tune output
Light can be dimmed or switched off
Auto shutoff when the water runs low
300 mL tank is enough for a small room
Simple setup with included AC adapter

Cons

No timer or app control
Small tank needs frequent refills
Corded power limits placement
Mist output drops as the tank empties

Mainstays Ultrasonic Cool Mist Essential Oil Diffuser prices at every store

WalmartNew
In stock
$26.00Checked 20 h ago
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What reviewers say

4.1 / 5665 ratings

Owners rate it around 4.1 out of 5 and mostly call it a good value starter diffuser that mists well and looks nice on a nightstand. Complaints center on the small tank, short run time and mist that weakens toward the end of a fill.

What people mention

Tank sizeCriticisedOwners say the 300 mL reservoir empties fast and needs refilling most nights.
Mist outputMixedReviewers like the four stages but note the mist gets weaker as the water level drops.
NoisePraisedMost owners find it quiet enough to run overnight in a bedroom.
LightMixedThe glow is liked as a night light, though some find the brightest setting too strong.
SetupPraisedBuyers describe filling and starting it as quick and simple.
CleaningCriticisedSome owners say it needs frequent cleaning to keep misting properly.

About the Mainstays Ultrasonic Cool Mist Essential Oil Diffuser

The Mainstays Ultrasonic Cool Mist Essential Oil Diffuser uses ultrasonic cool mist to bring fragrance to a room. It has a 300 mL water reservoir. To use it, fill the reservoir with water and add a few drops of essential oils or fragrance oils. The diffuser then disperses a cool mist into the space.

Four mist stages let you adjust the output. The light has adjustable settings for a soft glow, and it can be turned off entirely. When the water runs low, the diffuser shuts off automatically. It runs on corded electric power.

Type: Ultrasonic cool mist essential oil diffuser
Water capacity: 300 mL
Mist settings: 4 mist stages
Light: Adjustable settings, can be turned off
Auto shut-off: Yes, when water runs low
Power: Corded electric, AC wall adapter
In the box: Diffuser, AC wall adapter

Specifications

color: GreenSource

Questions and answers

How long does one fill last?: The 300 mL tank typically runs a few hours on lower mist settings and less on the highest stage. Expect to refill it most nights if you run it all evening.
Can I use it without the light on?: Yes. The light settings are adjustable and can be turned off entirely, so you can run mist only in a dark room.
Does it turn off by itself?: Yes. It shuts off automatically when the water runs low, which protects the unit from running dry.
What do I need to add besides water?: Water plus a few drops of essential oil or fragrance oil. The diffuser and an AC wall adapter are included; it runs on corded electric power.
Is it good for a large living room?: It is better suited to a bedroom, office or other small room. A larger space will dilute the scent, and the small tank limits long runs.
How does it compare with pricier diffusers?: It covers the basics: cool mist, adjustable output, a light and auto shutoff. Pricier models add timers, app control and larger tanks, which this one lacks.
Where is the Mainstays Ultrasonic Cool Mist Essential Oil Diffuser cheapest?: At Walmart, for $26.00, as of our latest check.
What do buyers say about the Mainstays Ultrasonic Cool Mist Essential Oil Diffuser?: Rated 4.1 out of 5 from 665 ratings.