Dreame L40s Ultra review
A full-dock Dreame with no camera: 19,000 Pa, a line laser for obstacles, EasyLeap wheels for 22 mm sills, pads that lift 10.5 mm and detach, a 75 °C wash, four maps and 220 minutes a charge.
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Review method: Specification analysis
Our verdict
The L40s Ultra is an L40s without a camera, and in some homes that is the reason to choose it. A LiDAR draws the map and a single-laser 3D structured light reads obstacles, so nothing on board takes pictures, and Dreame claims no pet recognition. The rest is a full L-series package: 19,000 Pa behind a DuoBrush certified tangle-free, a carpet boost, a side brush that extends and lifts, two spinning pads that swing out, lift 10.5 mm and detach, EasyLeap wheels for a 22 mm sill or a 40 mm double step, and four maps. The dock washes at 75 °C on a self-cleaning board with 20 nozzles, dries with hot air, refills from 4.5 litres and stores dust for 100 days. 5,200 mAh give 220 minutes of quiet vacuuming, and the warranty is three years. The laser steers round a shoe without knowing it is one. American shop only.
Pros
- No camera on board: LiDAR mapping and a single-laser structured light for obstacles
- The dock washes at 75 °C, dries, refills and stores dust for 100 days
- Pads lift 10.5 mm, extend and detach; the side brush extends and lifts
- 19,000 Pa with a tangle-free DuoBrush and a carpet boost
- Four maps, 220 minutes a charge and a 3-year warranty
Cons
- Structured light avoids obstacles without recognising them
- No noise figure, charging time or robot tank size published
- Single sills only up to 22 mm
- Sold on the American shop only
Best for
- Homes where a camera on a roaming robot is not welcome
- Hard floors with a few rugs and low sills
Not recommended for
- Pet owners who want the robot to recognise what lies on the floor
- European buyers who want to buy from Dreame directly
Score breakdown
- Cleaning
- 90 /100
- Navigation
- 75 /100
- Mopping
- 92 /100
- Obstacle Avoidance
- 58 /100
- Automation
- 90 /100
- Ease of Use
- 97 /100
- Reliability
- 73 /100
- Value
- 69 /100
In detail
Suction and brushes
The manufacturer rates the suction at 19,000 Pa. That is less than most of the 105 robot vacuums we list. The main brush is the tangle-resistant type, with one side brush. On carpet the suction rises automatically. The onboard bin holds 310 ml.
Mopping
Mop system: twin spinning pads. For carpet runs it leaves the mop at the dock. The mop swings out to reach along walls.
Navigation and obstacles
It navigates by LiDAR and avoids obstacles with structured light. It stores 4 floor plans. It climbs thresholds up to 22 mm. That is less than most of the 65 robot vacuums with a published figure. No-go zones can be drawn in the app.
The dock
The dock empties the bin, washes and dries the mop and refills the water tank. The dust bag lasts about 100 days.
Battery, charging and noise
One charge runs up to 3 h 40 min. The manufacturer publishes no noise figure.
Specifications
Cleaning
- Suction
- 19,000 Pa
- Brush system
- Tangle-resistant
- Side brushes
- 1
- Carpet boost
- Yes
- Dustbin
- 310 ml
- Side brush
- Extends and lifts
- Hair length handled without tangling
- Up to 30 cm, TÜV SÜD certified tangle-free
Navigation
- Mapping
- LiDAR
- Obstacle avoidance
- Structured light
- Saved floor plans
- 4
- Threshold climb
- 22 mm
Mopping
- Mop type
- Twin spinning pads
- Mop lift
- Detaches for carpet
- Extending mop
- Yes
- Water tank
- Not published
Dock
- Self-emptying
- Yes
- Mop washing
- Yes
- Mop wash temperature
- 75 °C
- Mop drying
- Yes
- Water refill
- Yes
- Plumbed drain
- No
- Dust bag interval
- 100 days
- Washboard
- AceClean DryBoard, 20 spray nozzles, self-cleaning
- Water tanks
- 4.5 l clean, 4.0 l dirty
- Dust bag
- 3.2 l
- Dock size and weight
- 340 × 457 × 590 mm, 9.2 kg
- Plumbing kit
- Automatic refill and drain kit sold separately
Software
- No-go zones
- Yes
- Pet waste recognition
- No
Power
- Battery
- 5,200 mAh
- Runtime
- 3 h 40 min
- Charging time
- Not published
Connectivity
- Wi-Fi
- Yes
- Bluetooth
- No
- 4G / LTE
- No
- Voice control
- Yes
Physical
- Weight
- 4.1 kg
- L × W × H
- 350 × 350 × 97 mm
- Noise
- Not published
Support
- Warranty
- 36 months
- Released
- Not published
Chassis
- Double-step threshold
- 40 mm over two steps more than 30 mm apart (EasyLeap auxiliary wheels)
Dreame US product page, Specifications table, model comparison table and disclaimers, retrieved 2026-10-19; inches and pounds converted
Where to buy
Prices are read every night from the manufacturers' shops that list the machine, and shown as read. A price no read has confirmed for several days is marked with the day it was last seen. Where a week or more of readings exists, the lowest we recorded in the last 30 days is stated as well. RoboVerdict may earn a commission when you buy through links on our site. This does not affect our rankings. As an Amazon Associate I earn from qualifying purchases.
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