How much water does it hold and how long does it run?

The reservoir holds 100 mL. Run time depends on the mist level; on the lowest setting it lasts longer, but expect frequent refills on high.

How much essential oil should I add?

Add 3 to 5 drops of essential oil to the water after filling to the max line, then replace the inner lid and cover.

Can I use it as a night light?

Yes. It has selectable light settings, and you can run the light with or without mist.

Is it good for a large living room?

No. The 100 mL tank and small output suit a bedroom, office or bathroom; a larger room needs a bigger diffuser.

What comes in the box?

The diffuser, an inner lid and cover, and a power adapter.

Mainstays Essential Oil Diffuser, Cool Mist Ultrasonic, 100mL

Best price now

$19.96at WalmartChecked 20 h ago

Prices are checked against each store and labelled with when.

Visit Walmart

Mainstays Essential Oil Diffuser, Cool Mist Ultrasonic, 100mL

Best price now

$19.96at 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 $19.96 at Walmart on Nov 14.

Our take on the Mainstays Essential Oil Diffuser, Cool Mist Ultrasonic, 100mL

The Mainstays Essential Oil Diffuser is a small ultrasonic diffuser with a 100 mL reservoir, built for tabletop use in a bedroom, office or bathroom. It offers four mist levels and selectable light settings, and shuts off automatically when the water runs low or the unit runs dry. The round acrylic body in teal is compact enough for a shelf or nightstand. Against larger ultrasonic diffusers it trades run time and room coverage for a simple, low-cost design; owners rate it around 4.1 out of 5, liking the mist output and light options while some report short run times and units that stop working.

Best forSmall bedrooms and nightstandsDesks and home officesBathrooms and small entrywaysBuyers wanting a simple, compact diffuser

Pros

Four mist levels let you adjust output
Selectable light settings double as a night light
Automatic shutoff when water runs low or dry
Compact round acrylic body fits small surfaces
Simple fill-and-add-oil setup

Cons

100 mL reservoir means frequent refills
Mist covers only a small room
Some owners report units failing within months
Light and mist controls are basic, with no timer or app

Mainstays Essential Oil Diffuser, Cool Mist Ultrasonic, 100mL prices at every store

WalmartNew
In stock
$19.96Checked 20 h ago
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What reviewers say

4.1 / 5709 ratings

Owners rate it around 4.1 out of 5. Many like the adjustable mist and the soft light for bedrooms, while a recurring complaint is short run time and units that quit working after a few months.

What people mention

Mist outputPraisedOwners say the mist is strong for such a small unit and the four levels are useful.
Run timeCriticisedThe 100 mL tank empties quickly, so owners refill it often.
DurabilityCriticisedSome owners report the unit stops misting or fails within a few months.
LightPraisedThe selectable light settings are liked as a soft night light.
SetupPraisedFilling to the max line and adding a few drops of oil is quick and simple.
Room coverageMixedIt scents a small bedroom or office but is too weak for open living spaces.

About the Mainstays Essential Oil Diffuser, Cool Mist Ultrasonic, 100mL

The Mainstays Essential Oil Diffuser is a cool mist ultrasonic diffuser with a 100 mL water reservoir. It has a compact, round acrylic body in a teal finish and stands on its own on a table, shelf or countertop.

To set it up, fill the reservoir to the max line and add 3 to 5 drops of essential oil to the water. Replace the inner lid and cover, then connect the power adapter and plug it into a wall outlet.

The diffuser has four mist levels and selectable light settings, so you can adjust the amount of mist and light. It shuts off automatically if the water runs low or the unit runs dry.

Type: Cool mist ultrasonic essential oil diffuser
Capacity: 100 mL water reservoir
Material: Acrylic
Finish: Teal
Mist levels: 4
Light: Selectable light settings
Safety: Automatic shut-off when water is low or the unit runs dry
Oil per fill: 3 to 5 drops of essential oil
Power: Power adapter, plugs into a wall outlet
Pack count: 1

Specifications

actual_color: TealSource
count_per_pack: 1Source
color: BlueSource

Questions and answers

How much water does it hold and how long does it run?: The reservoir holds 100 mL. Run time depends on the mist level; on the lowest setting it lasts longer, but expect frequent refills on high.
How much essential oil should I add?: Add 3 to 5 drops of essential oil to the water after filling to the max line, then replace the inner lid and cover.
Does it shut off on its own?: Yes. It shuts off automatically when the water runs low or the unit runs dry.
Can I use it as a night light?: Yes. It has selectable light settings, and you can run the light with or without mist.
Is it good for a large living room?: No. The 100 mL tank and small output suit a bedroom, office or bathroom; a larger room needs a bigger diffuser.
What comes in the box?: The diffuser, an inner lid and cover, and a power adapter.
Where is the Mainstays Essential Oil Diffuser, Cool Mist Ultrasonic, 100mL cheapest?: At Walmart, for $19.96, as of our latest check.
What do buyers say about the Mainstays Essential Oil Diffuser, Cool Mist Ultrasonic, 100mL?: Rated 4.1 out of 5 from 709 ratings.