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Comparing 2 robot vacuums

Your shortlist side by side: today’s price, our score and every fact the maker states.

Green is the best of these 2, also when they share the lead.

Lefant M3 × Best on 1 fact Dreame L40s Ultra AE × Best on 6 facts
Most important facts
Lowest price – –
Score not in our ranking 7.4
Customer rating – ★ 4.7 · 618 reviews
Tests – Just A Dad Approved Vacuum Wars
Suction power higher is better 12,000 Pa 19,000 Pa best
Runtime per charge longer is better 220 min best 180 min
Climbs thresholds up to higher is better 0.6 in (15 mm) 0.8 in (20 mm) best
Robot height lower is better same on both 3.8 in (9.7 cm) 3.8 in (9.7 cm)
Mop lift on carpet higher is better 0.4 in (9 mm) 0.4 in (10.5 mm) best
Dust bag lasts longer is better up to 90 days up to 100 days best
Navigation same on both LiDAR turret LiDAR turret
Rank
Rank – rank 36 of 94 with an all-in-one station
Mopping
Mop type same on both spinning pads spinning pads
Automatic mop detach same on both no (assumed) no (assumed)
Washes the mop same on both yes yes
Hot-air drying no (assumed) yes (best)
Station
Station same on both all-in-one station all-in-one station
Plumbing hookup no (assumed) yes (best)
Brush and obstacles
Anti-tangle brush same on both yes yes
Obstacle avoidance – AI camera
Climbing system for high thresholds same on both no (assumed) no (assumed)
Noise and age
Noise while cleaning not judged – 74 dB
On the market since December 2025 April 2025
Suction and brushes
Suitable for pet hair same on both yes yes
Extending side brush – no (assumed)
Carpet detection – detects carpet
Dirt detection – yes
Mopping
Mop extends to the edges – yes
Mop refreshed while mopping – no (assumed)
Dock
Empties the dust bin same on both yes yes
Bagless same on both no no
Dust bag capacity same on both 3.2 l 3.2 l
Wash temperature 113 °F (45 °C) 167 °F (75 °C)
Dries the mop same on both yes yes
Dispenses detergent same on both yes yes
Clean water tank – 4.5 l
Dirty water tank – 4 l
Navigation and obstacles
Camera on board – obstacle camera
Stair-edge sensors – yes
Robot
Robot diameter 12.6 in (32 cm) 13.8 in (35 cm)
Robot weight – 8.8 lb (4 kg)
Dust bin in the robot – 395 ml
Battery
Battery capacity same on both 5,200 mAh 5,200 mAh
Charging time – 3.5 h
Smart features and warranty
Voice assistants Google Assistant Alexa, Google Assistant, Siri
Wi-Fi band 2.4 and 5 GHz –
Matter – no (assumed)
Warranty – 2 years
Scheduled runs – yes

Facts as the maker states them. A dash means the maker does not name it. Each model’s page gives the source of every fact. Noise is the maker’s own figure, so we do not judge it, and a customer rating only counts from 20 reviews.

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