Pros & Cons
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- Thorough cutting and edging performance
- Excellent navigation and maneuvering
- Fast
- Quiet
- Long battery life
- No-cost 4G connectivity for five years
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- Expensive
- Requires an antenna wired to its base station
Segway Navimow X390 Specs
| Anti-Theft | |
| Connectivity | Bluetooth |
| Connectivity | GPS |
| Connectivity | Wi-Fi |
| Cutting Time | 240 |
| Cutting Width | 9.3 |
| Lawn Coverage | 2.5 |
| Mobile App | |
| Rain Sensor | |
| Remote Steering | |
| Sound Level | 60 |
The Segway Navimow X390 is the top-tier robot lawn mower in the company's X3 series, capable of handling an astonishing 2.5 acres in a day thanks to a beefy battery and speedy navigation. It features 4G cellular connectivity and uses an RTK antenna to help it achieve centimeter-level accuracy. It's fast and quiet, and after several weeks of testing the robot, it’s hard to find any notable downsides other than its sky-high $4,999 price. From highly polished hardware and software to excellent cutting performance, it earns our Editors' Choice as the best robot lawn mower for large yards.
Features: A Cellular-Connected Mowing Machine
The Navimow X3 series comes in a few different models, with the primary differentiators being battery size, speed, and cellular connectivity. The X390 is the most capable, with a rating of 2.5 acres. It promises 240 minutes of battery life per charge, double that of the entry-level model in the series, the $2,299 Navimow X315 (120 minutes), which is meant for lawns up to 0.5 acres. Segway also offers the midrange $2,799 Navimow X330, meant for 1 acre or less, and the $3,499 Navimow X350, meant for up to 1.5 acres.
(Credit: Tyler Hayes)The X390 is the fastest of the bunch, capable of traveling 3.3 feet per second, though the others aren’t exactly slow, at 2.6 feet per second. The X3 series models also differ in weight and recharge times.
If you are planning on using a robot mower on a large area far from Wi-Fi, the X390 is well equipped to handle that scenario. The X390's price includes five years of cellular connectivity. That drops to three years with the X350, two years with the X330, and one year with the X315. When the free cellular connectivity period is up, you can renew the 4G service for $32.90 per year, $65.80 for two years, or $98.70 for three years.
Otherwise, the feature list is cohesive across all X3 series models. Each has six blades, a 9.3-inch cutting width, and a cutting height range of 2 to 4 inches. They have a 50% (27-degree) max slope capability, a noise level averaging 60 decibels, an IP66 weather resistance rating, and theft deterrents like GPS tracking and an alarm. You can choose from three operating modes: quiet, standard, and efficient.
If you need an even more rugged robot lawn mower, consider the $2,999.99 Husqvarna 435X AWD, which is rated for lawns up to 0.9 acres and slopes with up to a 70% (35-degree) angle, or the remote-controlled Mowrator S1 ($3,999), which can climb a 75% (37-degree) incline.
One area where the X3 series stands out is the ability to attach accessories to the side. There is a dedicated expansion bay for this purpose. Currently, I only see a $300 edge trimmer accessory available for sale, but the website mentions a mosquito repellent module and fertilizer spreader, which will presumably be available in the future.
Battery Life: It Keeps Going
The X390’s 240-minute battery life is very impressive, well exceeding the $2,999.99 Ecovacs Goat A3000 (118 minutes), the $1,999.99 Eufy E18 (110 minutes), and the Husqvarna 435X AWD (100 minutes).
In my testing, the X390 barely showed a battery percentage change after mowing a small, 350-square-foot suburban lawn. It went from 100% to 96% with about 14 minutes of mowing using the standard mode.
To get a better sense of its real-world battery life, I took it to another, bigger grass area. I mapped the perimeter of 0.37 acres and then turned it loose. It took 1.2 hours for the X390 to cut around 4,400 square feet. After that amount of time, it had 80% battery remaining.
Setup, Mapping, and App Control: A Piece of Cake
The Navimow X390 mower is close to ready to use out of the box. Its minimal charging base station snaps together in three parts and has ground screws for fixing it to grass or dirt.
Unlike the E18 or the Goat A3000, the X390 comes with an RTK antenna for positioning. Although that’s the most complex part of the assembly, it only requires connecting a few pipes and cables. Segway's EFLS 3.0 navigation system combines satellite positioning and other sensor data to pinpoint the robot's location.
The Navimow mobile app (available for Android and iOS) guides you through the antenna placement step, checking that it has a good signal along the way. Setting up the antenna wasn’t difficult, but it may take some time to find a suitable location for it. It should have a clear view of the sky and be within reach of the mower’s charging station, which must be close to an AC outlet.
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(Credit: Tyler Hayes)By default, you’ll need to manually drive the X390 around the lawn to map the perimeter and give it boundaries. The robot also has an auto-mapping capability to assist when needed. Using on-screen virtual joysticks in the app to maneuver the robot around wasn’t hard, but a little tricky in tight spaces.
The first time I tried the auto-mapping capability, I was impressed as the robot drove around a tree and avoided a metal pole in its way. However, I had one instance later on where the auto-mapping function navigated the robot too close to a brick wall, and it got stuck. That was the only time it showed any visual hesitation or misstep.
(Credit: Segway/PCMag)Having cellular connectivity might be redundant if you have a strong Wi-Fi signal that can reach your entire yard. However, when mowing a large or remote area, this secondary option to receive an internet connection might be crucial. When I took the mower to the large grass area, away from a backyard lawn, I didn’t need to do anything for the X390 to get online. It worked immediately using cellular and continued functioning normally. Even on the outskirts of your acreage, you should be able to communicate with it and track it down if need be.
The app's map management functions are only available when you're within Bluetooth range of the mower. That's disappointing, but not a deal-breaker.
Overall, the app is clean and polished, but a few features were a little tricky to find. For example, there's a doodle feature that will let you cut shapes, text, and other designs into your yard, but it's only accessible in the map settings. I can't speak to how doodling on your grass works because I was too nervous to try it, but it's a fun idea.
Cutting Performance: Quick and Thorough, Even on the Edges
As mentioned, I started my evaluation of the Navimow X390 on a 350-square-foot lawn, and it maneuvered across the space with ease. When I initially mapped this grass area, I had it straddle the side, bumping up against pavers for edge cutting. In most uses, the X390 handled the edge trimming well enough, never leaving egregious clumps of grass. It wasn’t perfect, however, so if you’re the meticulous type, you’ll still need to keep an edger handy.
The other side of the lawn, with a brick wall, was a different story. It cut well without ever touching the wall, but it left about a 7- or 8-inch gap. That’s as close as it could seemingly get. The 9.3-inch cutting disc underneath is shifted to the left, which keeps it from getting too close to fences and similar borders on its right side. This won't be an issue for more rural settings with less-defined edges. It does make it less ideal for people with tight, well-manicured grass lawns.
(Credit: Tyler Hayes)Of course, the Navimow X390 is best utilized for larger spaces. To test this, I took the mower to a sprawling grass area. After mapping the perimeter, it measured the area as 0.37 acres. I started the mower off in its standard mode. It started around the edges with two passes around the outside boundary before starting to move back and forth from one side to the other. Even with the long stretches it was doing, it had visibly straight lines.
There were a few oddities. For instance, the X390 seemed to move around some dirt patches, but not all of them. I couldn’t tell if it sensed looser ground or it mistook grass tufts as unidentifiable objects. Ultimately, this didn’t hinder its cutting performance, only adding a bit of time to its job. Even when encountering damp grass or bits of mud, the beefy, notched wheels never showed signs of traction loss.
(Credit: Tyler Hayes)After about 40 minutes, I used the mower’s mobile app to switch to its efficient mode. It moved visibly faster on its long stretches, but still used caution while approaching people or objects. If I were constantly mowing a larger space like this, I would keep it set to the efficient setting. It still overlapped enough not to miss any spots and didn’t appear to compromise on performance, even scooting at the faster pace.
The app also lists a quiet mode. Since the X390 is already extremely quiet, I would be hesitant to sacrifice any speed for a decibel or two lower volume. The X390 isn’t just quiet compared with traditional push mowers or other yard equipment; it’s just plain quiet in general.
While the dot-matrix display is most useful when the device is on its dock charging, it is still put to use in the field, too. It shows a spinning disc when the blades are active. In bright sunlight, it's dim, but still readable. Charmingly, the display flashed the word "Hi" when it approached me on one of its turns, indicating person recognition.