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Xiaomi Robot Vacuum S40 Pro specifications and in-depth review

Xiaomi Robot Vacuum S40 Pro

Manufacturer: Xiaomi

The Xiaomi Robot Vacuum S40 Pro is a mid-range robot vacuum cleaner designed to handle a variety of floor types through a combination of navigation intelligence and solid cleaning performance. It supports scheduled cleaning runs, auto-docking, virtual barriers, and no-go zones, all manageable remotely via smartphone and compatible with both Google Assistant and Amazon Alexa.

Underneath, the S40 Pro delivers 15000 Pa of suction power across four cleaning modes, backed by a 5200 mAh battery that provides up to 180 minutes of runtime per charge, with a full recharge taking approximately 5 hours. The unit weighs 4200 g, measures 355 mm wide and 99 mm tall, includes a 0.43-litre dustbin, a HEPA-grade allergy filter, an obstacle sensor, an anti-fall sensor, and a dirt sensor, and connects wirelessly via Wi-Fi 4 (802.11n).

Pros
  • 15000 Pa of suction power covers all floor types across four cleaning modes
  • 180-minute runtime allows extended cleaning sessions without interruption
  • Mapping, route mapping, no-go zones, and virtual barriers give users precise control over cleaning areas
  • Built-in dirt sensor automatically focuses effort on heavily soiled spots
  • Anti-stuck and anti-fall sensors reduce the risk of the robot getting trapped or falling
  • Compatible with both Google Assistant and Amazon Alexa for voice-based control
Cons
  • Not self-emptying, so the 0.43-litre dustbin requires manual emptying
  • No carpet detection available
  • Washable filters are not included, adding to ongoing maintenance considerations
  • Mopping function is listed as supported, but mop cleaning, mop raising, and mop drying are all absent, limiting the practical usefulness of that capability
  • A full recharge takes 5 hours, which is a relatively long turnaround time
  • No voice prompts, which may reduce ease of use for some users
Who is this for?

This robot vacuum suits households with mixed floor types and moderate-to-large floor plans, where the 180-minute runtime and strong 15000 Pa suction can handle extended cleaning sessions without constant intervention. Users who want structured, hands-off cleaning will appreciate the mapping, route mapping, no-go zones, and scheduling capabilities, along with Google Assistant and Alexa compatibility for voice-triggered routines. The dirt sensor and anti-stuck behaviour make it a practical choice for everyday home use where reliability and consistent coverage matter.

Who is this NOT for?

Users who want a fully automated, low-maintenance setup will find the lack of self-emptying functionality a notable limitation, as the 0.43-litre dustbin requires regular manual attention. Those with significant carpeted areas will be at a disadvantage given the absence of carpet detection, and households looking for a combined wet-and-dry cleaning solution should look elsewhere, as mop cleaning, mop raising, and mop drying are all unsupported despite mopping being listed as a feature. The 5-hour charge time may also be a drawback for users managing frequent or back-to-back cleaning sessions.

General info:

has HEPA filter ✓
audible noise 62 dB
has an allergy filter ✓
compatible with Google Assistant ✓
works with Alexa ✓
release date November 2025
weight 4200 g
width 355 mm
height 99 mm
thickness 350 mm
volume 12300.75 cm³
warranty period 1 years

The Xiaomi Robot Vacuum S40 Pro includes both a HEPA filter and an allergy filter, making it suited for households where air quality during cleaning is a consideration. It operates at an audible noise level of 62 dB and is compatible with both Google Assistant and Amazon Alexa for voice control integration. Physically, the unit weighs 4200 g and measures 355 mm wide, 350 mm deep, and 99 mm tall, with a total volume of 12300.75 cm³. It comes with a one-year warranty.

Features:

has mapping ✓
supports no-go zones ✓
supports a remote smartphone ✓
has an obstacle sensor ✓
has problem area cleaning ✓
is self-emptying ✕
has carpet detection ✕
doesn't get stuck ✓
supports virtual barriers ✓
has route mapping ✓
Has voice prompts ✕
auto docking ✓
has anti-fall sensor ✓
can be scheduled ✓
has a remote control ✓
supports Wi-Fi ✓
Wi-Fi version Wi-Fi 4 (802.11n)
has mop cleaning ✕
has mop raising ✕
has mop drying ✕

The S40 Pro offers a well-rounded set of navigation and control features, including mapping, route mapping, no-go zones, and virtual barriers, giving users meaningful control over where and how the robot cleans. It supports scheduled cleaning, auto-docking, and anti-stuck behaviour, and its anti-fall sensor helps it navigate drop-offs safely. The unit can be controlled remotely via smartphone or a dedicated remote control, and it connects over Wi-Fi 4 (802.11n). It does not support self-emptying, carpet detection, or voice prompts, and mop-related functions — including mop cleaning, mop raising, and mop drying — are not available on this model.

Design:

dustbin capacity 0.43 l
has twin side brushes ✕
has included washable filters ✕
automatically adjusts its height ✓

The S40 Pro has a dustbin capacity of 0.43 litres and automatically adjusts its height to adapt to different floor surfaces. It does not include twin side brushes, and the filters included with the unit are not washable.

Cleaning power:

suction power 15000 Pa
cleans all floor types ✓
cleaning modes 4
mops ✓
has a dirt sensor ✓

The S40 Pro delivers 15000 Pa of suction power and is capable of cleaning all floor types, with four selectable cleaning modes to suit different needs. It also supports mopping and is equipped with a dirt sensor that detects heavily soiled areas for more focused cleaning attention.

Power:

battery power 5200 mAh
runtime 180 min
charge time 5 hours
operating power consumption 55W

The S40 Pro is powered by a 5200 mAh battery that supports up to 180 minutes of runtime on a single charge, making it capable of covering larger areas before needing to return to base. A full recharge takes approximately 5 hours, and the unit draws 55W during operation.

Final Verdict

The Xiaomi Robot Vacuum S40 Pro is a capable and well-featured robot vacuum that covers the essentials of autonomous home cleaning with confidence. Its 15000 Pa suction paired with intelligent mapping, scheduling, and no-go zone support makes it a practical choice for users who want structured, reliable floor coverage across different surface types. That said, the absence of self-emptying, carpet detection, and meaningful mop functionality means it works best as a dry-cleaning vacuum rather than an all-in-one solution. For households seeking a dependable, app-connected vacuum with solid navigation and strong suction — without requiring the full automation of premium tiers — the S40 Pro delivers a focused and sensible package.