Segway Navimow i105N Robot Lawn Mower Review

The i105N earns its place on the easy part of a yard, and it does so with a set of features that usually cost extra elsewhere.

No perimeter wire to bury

You set the boundary in the app and the mower follows a virtual line. Nothing gets stapled into the turf, nothing gets cut by an edger, and moving the boundary is a matter of redrawing it on a screen.

Satellite positioning plus a camera

The EFLS 2.0 system pairs RTK satellite positioning for the boundary with a 140-degree camera and Visual SLAM for what sits in the grass. It recognizes more than 150 object types across animals, tools and fixed obstacles, and everyday clutter such as balls, toys and chairs, and it steers around them.

Mapping that helps itself

Built for weather and for quiet

The body, the dock and the power supply are rated IP66, and the working range is 32 to 104°F. Sound power is 58 dB(A), which is conversation level, so a 6 a.m. run won't wake the neighbors.

Light enough to move by hand

At 24 lb and 21.5 inches long, 11.2 inches wide and 15.2 inches tall, the mower is light enough for one person to lift off the lawn, carry to storage or flip to check the blades.

A box that saves a second order

The mower ships with the Garage S, 4G Access+, Rough Terrain Kit, Antenna Extension Kit, Blade Assembly and Antenna Extension Cable. Those are the accessories most buyers end up buying separately.

Coverage that matches the promise

The warranty runs 3 years on the mower and 2 years on the battery and power supply. Buyers on Amazon most often praise reliability, setup and the time it gives back, and the value for money comes up again and again.

The same design choices that make the i105N simple also leave grass uncut and grip wanting in a few predictable places.

A strip along every fence and wall

Standard boundary mode keeps a safe buffer from the edge, so a band of grass along fences, walls and beds stays long and needs a trimmer. It is a trade-off of the design rather than a fault. Edge mode narrows the gap on flat, flush borders, but it does not remove the trimmer from your shed.

Grip on slopes and soft ground

Stability is the weakest theme in buyer feedback on Amazon, and the slope rating explains why. The mower is rated for Perimeter wire: Wire free. The wheels can lose grip on damp grass, ruts and banks, and the Rough Terrain Kit helps without turning the i105N into a slope machine.

No drop-off detection

There is no cliff sensor. On a lawn that ends at a curb, a retaining wall or water, the mower has nothing to stop it from going over.

No rain sensor

Weather adaptation works from the forecast, not from a sensor on the machine. A sudden shower won't stop a run in progress, and a wrong forecast can skip a session you wanted.

A cutting window that stops at 3.6 inches

Height adjusts from 2.0 to 3.6 inches across five positions. That suits cool-season lawns and Bermuda kept short. A St. Augustine lawn held at 3.5 to 4 inches sits at or beyond the top of the range, and tall grass is a reported weak spot: buyers on Amazon are divided on cutting performance, and some mention trouble in grass left long.

Divided opinion on navigation and battery

Amazon buyers split on navigation, with some mapping a yard easily and others struggling with the programming. Battery life is also a mixed theme, with several buyers reporting the battery gives out after two seasons. The 2-year battery warranty is the backstop there.

No voice assistant

The i105N does not work with Alexa or Google Assistant. Everything runs through the app.

Antenna placement is the real work

The open-sky spot the antenna needs may turn out to be a narrow side passage rather than the middle of the lawn. Expect to try a few positions before the signal holds.

These are the figures for the US model. The European version of this mower cuts to a lower height window, so specs from reviews written outside the US do not apply to the i105N.

The GNSS antenna is required unless the manufacturer's Network RTK service covers your ZIP code, in which case the mower can run without one. Check that coverage before you plan where the antenna goes.

The physical install is the easy part: set the dock, plug in the power supply, mount the antenna on its stake or a wall, then pair the mower with the app. Mapping is AI-assisted, so the mower helps build the boundary rather than making you walk the whole perimeter.

Antenna placement is where the afternoon goes. The best open-sky spot may be a narrow side passage between a wall and a hedge, and you may need to try a couple of positions before the signal holds. The Antenna Extension Kit and cable in the box let you reach a roofline or an eave.

Network RTK can remove the antenna entirely if your ZIP code is covered, so check that first. The 4G Access+ module is included and supports a remote connection and tracking.

The i105N cuts with a 7.1-inch disc and three blades across five height positions. It gives a mulching cut, not a striped lawn, and the finish depends heavily on how you keep the grass between runs.

What the height window suits

At 2.0 to 3.6 inches, the mower fits cool-season lawns and Bermuda kept short. A long St. Augustine lawn is outside its range, and tall grass is a reported weak spot.

The edge strip and how to shrink it

Standard boundary mode leaves a buffer along fences, walls and beds, and that band needs a trimmer. Edge mode, which follows the boundary closely, helps where the grass meets flat hardscape with a gap under about 0.4 in (1 cm) and obstacles set back from the line. On a flush, level border it can cut most of the strip away; on a rough or raised edge it cannot.

What buyers see

Cutting performance is a divided theme among Amazon buyers. Cut quality can be less consistent at map edges and in dead spots, which the mower reads as obstacles to avoid.

How long does a lawn take?

At 0.015 to 0.025 acre per hour, a small lawn is done in a session or two. A full 1/8 acre takes several sessions spread across the day, which is normal for a mower that returns to its dock to recharge.

Satellite positioning and the camera together are the strength of this mower. It picks up balls, tools, chairs and pets reliably and routes around them instead of bumping through.

Trees are the weak point. Satellite signal degrades under a canopy. The camera carries the mower through those stretches, but expect slower, less tidy mowing in heavy shade. Narrow gaps between houses can also cost the mower its satellite fix, and it may then treat itself as outside the boundary and stop to search for it.

GPS accuracy is around a foot, so a boundary drawn right on a curb can let the mower roll into the street.

With no rain sensor, the mower follows the forecast. A sudden shower won't stop it, and a forecast that misses can cost you a session. Two-wheel drive and smooth tires are why stability is the weakest theme in buyer feedback; the Rough Terrain Kit helps on soft ground but does not change the slope rating.

The app handles schedules, zones, cutting height and boundary edits, and it manages several lawn areas separately. Night mowing is supported, and at 58 dB it is practical for a quiet street.

There is no Alexa or Google Assistant support on this model, so voice control is not part of the package. Firmware updates have improved mapping and edge behavior over time, though how much you notice depends on your lawn and how often you install them.

Each charge gives about 60 minutes of mowing, and a recharge takes about 90 minutes. At 0.015 to 0.025 acre per hour, a full 1/8 acre means the mower works through the day in cycles rather than in one pass.

Battery life is a mixed topic among Amazon buyers, with several reporting a decline after a couple of seasons. The 2-year battery warranty covers that window. Blades are consumables: a spare Blade Assembly is in the box.

The warranty runs 3 years on the mower and 2 years on the battery and power supply.

Buyers on Amazon most often praise reliability, setup and the time the mower gives back, and many describe it as worth the money. The large majority of ratings are four or five stars, and the summary of those reviews describes a mower that handles about 95% of a backyard well and takes roughly 2.5 hours on an average city lot.

The main themes are cutting performance, navigation and battery life. Some buyers map a yard without trouble and get a clean cut; others struggle with programming or hit problems in tall grass, and several report a battery that gives out after two seasons. Stability is the one theme that leans negative, which lines up with the slope rating and the two-wheel drive.

A few practical points come up again and again: a boundary drawn too close to a curb can let the mower roll off the lawn, and the mower can lose its fix between buildings. The pattern across all of it is a mower that is great on the easy part of a yard and fussy on the hard part. The platform has several seasons of owner history behind it and a 3-year warranty on the machine, which is what makes that pattern tolerable.