Robot Vacuum Terms Explained: LiDAR, Pa & Suction Specs

Plain-English robot vacuum glossary: what LiDAR, Pa suction, self-emptying, mopping combos, runtime, carpet boost and no-go zones actually mean.

Last verified: August 1, 2026

What VacuumTested is

VacuumTested is an independent robot vacuum review site that researches and compares robot vacuums for different homes, floors, pets, and budgets.

Guide facts

Guide type
Informational buying and maintenance guidance
Audience
Robot vacuum owners and buyers
Evidence standard
Published testing methodology and model-level review data

How to use this page

  1. Start with the section that matches your question or household situation.
  2. Use the linked reviews and best-of lists to compare specific models.
  3. Recheck current product details before acting on time-sensitive information.

Product examples

What these features look like

These current catalog examples show the product types discussed on this page. Use the linked reviews to check model-specific scores, use cases, and trade-offs.

Roborock Saros 20
Roborock Saros 20
Roborock catalog example
Roborock Saros 10R
Roborock Saros 10R
Roborock catalog example
Dreame X60 Max Ultra Complete
Dreame X60 Max Ultra Complete
Dreame catalog example

Spec sheets are full of jargon. Here is what the terms actually mean and which ones matter for your home.

LiDAR
A laser that maps the room so the robot cleans in straight, predictable lines. The best choice for reliable navigation on most floor plans.
Obstacle avoidance
Cameras or sensors that help the robot steer around cables, shoes, and pet bowls instead of pushing them.
Self-emptying
A dock that automatically pulls debris from the robot's bin into a sealed bag or bin, so you rarely empty it by hand.
Mopping combo
A robot that vacuums and mops, usually with a reservoir for water or cleaning solution.
Self-washing dock
A dock that rinses, washes, and often dries the mop pads automatically after cleaning.
Runtime
How long the robot can clean before returning to charge. For large homes, look for longer runtime or auto-recharge and resume.
Carpet boost
The robot raises suction when it detects carpet or rugs, helping lift debris from low-pile surfaces.
No-go zones
Virtual boundaries in the app that keep the robot away from pet bowls, rugs, or rooms you do not want cleaned.
Multi-floor mapping
The robot saves more than one floor plan, which is essential if you have stairs or multiple levels.
Docking station
The base the robot returns to for charging, and on many models, for emptying or washing itself.
HEPA filter
A high-efficiency filter that captures fine dust and dander, useful for allergy-sensitive households.
Edge cleaning
Brushes or mop arms that reach wall edges and corners more closely than the main brush alone.

How to read a spec sheet

Ignore the biggest number first. Look instead at navigation type, brush design, dock automation, and whether the model saves multiple floor plans. Those features determine how the robot feels in daily use more than a pascal count or a marketing name.

Which specs actually matter for you

Not every term deserves your attention. These are the ones that change the buying decision for each household type.

If you care aboutWatch these specsYou can ignore
Pet hair and danderBrush roll design, self-emptying, HEPA filterJoinery name, colour options
Big or multi-level homeRuntime, recharge-and-resume, multi-floor mappingCompact-dock dimensions
Hard floors and moppingSelf-washing dock, mop lift, edge cleaningPeak pascal figure
Carpet and rugsCarpet boost, brush roll type, sealed suction pathMop pad wash temperature
Set-and-forget reliabilityLiDAR or mature camera navigation, no-go zonesCosmetic app themes

Pair this with the buying guide to turn specs into a shortlist.

Frequently asked questions

What does Pa (pascal) mean on a robot vacuum?
Pa measures suction pressure, and manufacturers quote their peak figure measured at the inlet in ideal conditions. It is a useful floor for comparison within one brand's lineup, but a lower-Pa robot with a better brush roll and stronger sealing can out-clean a higher-Pa model on carpet. Treat it as one input, not a ranking.
What is LiDAR navigation?
LiDAR uses a spinning laser to measure distances and build a map of your home. It works in the dark, maps quickly, and is the most common navigation on mid-range and flagship robots. Camera-based systems can be cheaper but need light and vary more in performance.
What is a self-empty dock?
A dock that automatically transfers debris from the robot's onboard bin into a larger bag or bin in the base. It cuts your emptying frequency from every run to roughly every four to eight weeks. It is separate from mopping and from mop-pad washing.
What is multi-floor mapping?
The robot stores more than one floor plan, so it can clean different levels without remapping each time. It matters in multi-storey homes and is usually limited to mid-range models and above. You still have to carry the robot between floors.
What does 'no-go zone' mean?
A boundary you draw in the app that the robot will not enter, such as around pet bowls, a Christmas tree, or a child's play mat. It requires app-based mapping, so budget models without mapping generally cannot do it.

Who this guide is for — and who it is not

A guide that claims to suit every reader suits none. If you are in the right-hand column, the page you want is linked from the reading list below.

This guide fits you ifIt does not if
  • You want the question on this page answered before you buy anything.
  • You will still check current product details before acting — specs and prices move.
  • You want buying advice rather than definitions — start with the buying guide.
  • You need a manufacturer-specific menu walkthrough; this glossary explains terms, not app screens.