# Dreame L40s Ultra review

Strong pet hair cleaner with a full dock at a deep discount

- Our score: 8.6 out of 10
- Price: $570 (checked Oct 31, 2026)
- Status: on sale
- Best for: pet owners with carpet on a budget
- Skip if: your floor often has cables, socks or toys
- HTML version: https://robotsforthat.com/robot/dreame-l40s-ultra/

## Verdict

The best carpet and pet hair performer of the L40s range, with a hot water mop dock, now far below its $1,399.99 launch price. Vacuum Wars measured 92% sand removal and 91% pet hair pickup with no tangles. Skip it if your floors are cluttered, since it avoided only 7 of 24 objects.

## Pros

- 92% carpet sand removal in Vacuum Wars testing
- 91% pet hair pickup, no tangles
- Extending side brush and mop
- Mop pads detach before carpet
- Deep discount from launch price

## Cons

- Avoided only 7 of 24 obstacles
- No camera
- Loud at max, 78 dB in Vacuum Chef testing
- No built in voice assistant
- Bulky base station

## Specs

- suction: 19,000 Pa claimed (Dreame); Vacuum Chef measured 490 FPM carpet airflow, well above average
- navigation: LDS LiDAR with Pathfinder, 4 maps (Dreame); Vacuum Wars measured 0.85 m2 per minute
- obstacle avoidance: 3D structured light only, no camera or object count (Dreame); Vacuum Wars saw it avoid 7 of 24 objects
- mopping: Dual spinning mops, 10.5 mm lift, extend and auto removal (Dreame); Vacuum Wars measured 0.95 g water left and a 259 combined mop score
- self empty: Yes, 3.2 L dust bag, up to 100 days (Dreame)
- dock features: Auto empty, 167 F (75 C) hot water mop wash, hot air drying, self cleaning washboard, auto detergent and water refill, 4.5 L clean and 4.0 L dirty tanks; water hookup kit sold separately (Dreame)
- runtime: Up to 220 min in quiet mode from 5,200 mAh (Dreame); Vacuum Wars estimated about 1,935 sq ft per charge
- dustbin: 310 ml robot bin plus 3.2 L dock bag (Dreame)
- height: 3.82 in (Dreame)
- pet hair: HyperStream Detangling DuoBrush (Dreame); Vacuum Wars measured 91% pet hair pickup, 92% carpet sand removal and 0% hair wrap
- app: Dreamehome app with third party voice assistants only (Dreame); Vacuum Chef notes no built in voice assistant or live video
- threshold: 1.57 in double layer and 0.87 in single steps (Dreame)
- noise: Vacuum Chef measured 78 dB at max suction

## Safety

- recalls: Not checked
- fcc: Not checked
- company status: Active
- warranty: 3 years (Dreame US store)

## Questions buyers ask

### Is it good for pet hair?

Yes. Vacuum Wars measured 91% pet hair pickup and no hair wrap with the DuoBrush.

### Does it avoid obstacles well?

No. It has no camera and avoided 7 of 24 objects in Vacuum Wars testing.

### Does it climb thresholds?

Dreame rates it for 0.87 in single steps and 1.57 in double layer steps.

## Sources

1. [Dreame US store: L40s Ultra](https://www.dreametech.com/products/l40s-ultra-robot-vacuum)
2. [Vacuum Wars: Dreame L40s series review](https://vacuumwars.com/dreame-l40s-series-review/)
3. [Vacuum Chef: Dreame L40s Ultra review](https://vacuumchef.com/dreame-l40s-ultra-review-powerful-suction-smart-mopping-real-world-performance-tested/?amp=1)
4. [Dreame newsroom: L40s series launch](https://www.dreametech.com/blogs/news/dreame-l40s-series-robot-vacuum-launch)
5. [Dreame blog: L40 Ultra Gen2 vs L40s Ultra vs AE vs CE](https://www.dreametech.com/blogs/blog/robot-vacuum-comparison-l40-l40s-ultra-ae-ce)