How often will the dock's dust bag need changing?

The dock holds a 3.2 L dust bag and empties the robot's 395 mL onboard bin automatically after runs. For most homes that stretches to roughly two months between bag swaps.

Can it fit under my low furniture?

The robot stands 3.8 inches tall, so it slides under many couches and cabinets. Its dock is larger at 23.2 inches high and 18 inches wide, so plan floor space near an outlet.

Will it climb thresholds between rooms?

It clears obstacles up to 20 mm, so most door sills and thin transition strips are no problem. Taller thresholds beyond that height can stop it.

How adjustable is the mopping for different messes?

It offers 32 mop moisture levels, letting you dial in anything from a light pass to a wetter scrub. The dual spinning pads wash in 167°F water at the dock to stay fresh.

Does it protect carpet while mopping?

Yes. The mop lifts up to 10.5 mm and the main brush lifts too, and Smart Carpet Cleaning detects carpet so the robot raises the pads before crossing onto rugs.

What smart controls does it support?

You get voice control through Amazon Alexa, Google Assistant, and Apple, plus no-go zones and multi-level maps for up to 4 floors. It also backs the robot with a 3-year warranty.

Top 16% overall

Dreame L40s Ultra AE

Name: Dreame L40s Ultra AE
Brand: Dreame
Price: 599.99 USD
Availability: InStock

A self-maintaining mid-range cleaner with precise LiDAR mapping, ideal for busy multi-story hard-floor homes.

$599.99

Buy at Amazon Best price

Compare 2 retailers · We may earn a commission if you make a purchase

8.4

At a glance

The highlights

Our Rating

8.4/10

Very Good

Cleaning8.6

Navigation8.7

Features7.1

ValueGood for the price

19,000 Pa

Average suction

$599.99

$28 below 90-day avg

Completely hands-free

Empties its own dustWashes its mopDries its mopRefills its waterDrains dirty waterAdds detergentCleans its dock

Dual spinning mop pads

Self-washing, extends to edges

LiDAR navigation

LiDAR mapping · AI camera obstacle avoidance · Night-vision light

Single (rubber & bristle with cutter)

Anti-tangle design

Where to buy

Compare prices

AmazonBest price

$599.99 Buy

Dreame

$669.99 Buy

We may earn a commission if you make a purchase

Price history

Is now a good time?

Good time to buy

Current best price is $28 below the 90-day average

The Dreame L40s Ultra AE is $600 right now, $28 below its 90-day average of $628. Over the period we have tracked it from $555 to $1,000.

Low $555Avg $628High $1,000

The good

Pros

19,000 Pa suction pairs with a rubber-and-bristle brush for strong pickup on floors and low-pile carpet.
Dual spinning mop pads actively scrub stuck-on messes with real pressure, not just passive dragging.
LiDAR plus an RGB camera and 3D structured light deliver top-tier navigation and obstacle avoidance.
Hands-off dock washes mops with 167°F water, empties dust, refills, and air-dries pads automatically.
180 minutes of runtime covers up to 1,808 sq ft per charge with recharge-and-resume.
Maps up to 4 floors with no-go zones and voice control via Alexa, Google, and Siri.

The trade-offs

Cons

Extendable side brush is absent, so tight corners can need a manual touch-up.
Feature set ranks lower than its cleaning and navigation, trailing the most loaded rivals.

How the numbers stack up

Performance vs the category

At 19,000 Pa, suction is about average for the robots we track (median 15,000 Pa).
At 180 min, runtime is on the modest side (median 200 min).
At 1,808 sq ft, single-run coverage is on the modest side (median 2,150 sq ft).
At 20 mm, threshold clearance is about average for the robots we track (median 20 mm).
At 3.2 L, dock dust bag is larger than most, ahead of about 59% of robots (median 3 L).

Who it's for

Busy households with mostly hard floors across several stories who want deep, hands-off cleaning and precise navigation around furniture, plus a dock that handles nearly all the upkeep on its own.

Who should skip it

Homes covered wall-to-wall in thick, high-pile carpet who need heavy scrubbing on rugs will get less benefit from a mop-focused system built for hard floors.

The bottom line

Our take

The Dreame L40s Ultra AE blends sharp LiDAR-and-camera navigation, strong suction, and active dual spinning mops into a genuinely hands-off package. Its self-cleaning dock does the dirty work, from washing pads in hot water to emptying dust. A confident pick for multi-floor, hard-floor homes wanting low-effort ownership.

Questions

Frequently asked

Every detail

Full specifications

Specifications

Head to head

How it compares

DEEBOT X11 OmniCyclone

P10 Pro Ultra

Similar robot vacuums

Similar Products

Dreame L40s Ultra AE

$599.99 · Best price

We may earn a commission if you make a purchase

Buy at AmazonBuy - $600

Top 16% overall

Dreame L40s Ultra AE

A self-maintaining mid-range cleaner with precise LiDAR mapping, ideal for busy multi-story hard-floor homes.

$599.99

Buy at Amazon Best price

Compare 2 retailers · We may earn a commission if you make a purchase

8.4

At a glance

The highlights

Our Rating

8.4/10

Very Good

Cleaning8.6

Navigation8.7

Features7.1

ValueGood for the price

19,000 Pa

Average suction

$599.99

$28 below 90-day avg

Completely hands-free

Empties its own dustWashes its mopDries its mopRefills its waterDrains dirty waterAdds detergentCleans its dock

Dual spinning mop pads

Self-washing, extends to edges

LiDAR navigation

LiDAR mapping · AI camera obstacle avoidance · Night-vision light

Single (rubber & bristle with cutter)

Anti-tangle design

Where to buy

Compare prices

AmazonBest price

$599.99 Buy

Dreame

$669.99 Buy

We may earn a commission if you make a purchase

Price history

Is now a good time?

Good time to buy

Current best price is $28 below the 90-day average

The Dreame L40s Ultra AE is $600 right now, $28 below its 90-day average of $628. Over the period we have tracked it from $555 to $1,000.

Low $555Avg $628High $1,000

The good

Pros

19,000 Pa suction pairs with a rubber-and-bristle brush for strong pickup on floors and low-pile carpet.
Dual spinning mop pads actively scrub stuck-on messes with real pressure, not just passive dragging.
LiDAR plus an RGB camera and 3D structured light deliver top-tier navigation and obstacle avoidance.
Hands-off dock washes mops with 167°F water, empties dust, refills, and air-dries pads automatically.
180 minutes of runtime covers up to 1,808 sq ft per charge with recharge-and-resume.
Maps up to 4 floors with no-go zones and voice control via Alexa, Google, and Siri.

The trade-offs

Cons

Extendable side brush is absent, so tight corners can need a manual touch-up.
Feature set ranks lower than its cleaning and navigation, trailing the most loaded rivals.

How the numbers stack up

Performance vs the category

At 19,000 Pa, suction is about average for the robots we track (median 15,000 Pa).
At 180 min, runtime is on the modest side (median 200 min).
At 1,808 sq ft, single-run coverage is on the modest side (median 2,150 sq ft).
At 20 mm, threshold clearance is about average for the robots we track (median 20 mm).
At 3.2 L, dock dust bag is larger than most, ahead of about 59% of robots (median 3 L).

Who it's for

Busy households with mostly hard floors across several stories who want deep, hands-off cleaning and precise navigation around furniture, plus a dock that handles nearly all the upkeep on its own.

Who should skip it

Homes covered wall-to-wall in thick, high-pile carpet who need heavy scrubbing on rugs will get less benefit from a mop-focused system built for hard floors.

The bottom line