This post might include affiliate links. Please see my policy.
The Sunseeker X3 Plus mows lawns of up to three-tenths of an acre with no boundary wire, combining RTK satellite positioning with camera vision to cover the grass in systematic lines. Sunseeker rates it for slopes of up to 30%. Its battery recharges in 1.5 hours, and an AI Vision camera watches for obstacles ahead.
Who It's For
The X3 Plus suits a suburban lawn of up to three-tenths of an acre that is flat or gently sloped, with no bank steeper than 30%. Your yard is mostly open to the sky, which the mower's satellite positioning needs. You would rather mark the lawn's edges in an app than bury a wire, and you are comfortable running the mowing schedule from your phone. You like to keep your grass somewhere between 1.6 and 3.2 inches tall.
Look Elsewhere If
You may want a different mower if any part of your lawn is steeper than 30%, the maximum Sunseeker gives for the X3 Plus. The UBHome M10 and the Sunseeker X7 are both rated for much steeper ground. A lawn bigger than three-tenths of an acre is also past its rating, while the X7, one tier up, is rated for a far larger area and can cut lower. Among the mowers compared here, only the UBHome M10 matches the X3 Plus on noise rating, so quiet running is no reason to switch.
Where To Buy
Key Features
Navigation And Boundary Setup. The X3 Plus fixes its position with RTK, a form of satellite positioning that a reference station corrects, and reads the lawn with camera vision. Together, the two let it work across the lawn in planned, systematic lines instead of a random pattern. The lawn's boundary is drawn in the app, which means no perimeter wire has to be pegged along its edges. Since RTK depends on signals from satellites, tall trees or buildings crowding the lawn could make positioning less reliable.
Slopes. Sunseeker rates the X3 Plus for slopes of up to 30%. Slope percent is the rise in height for every hundred feet of horizontal distance, so it measures something different from degrees. A rating at this level suits a lawn that is flat or gently sloped, and the mower has two-wheel drive, with no all-wheel grip to lean on. If your yard includes a steep bank, though, measure it before you buy, since Sunseeker does not rate the mower for anything steeper.
Cutting Height And Width. The cutting height adjusts from 1.6 to 3.2 inches. That range leaves out very short and very tall settings, so if you keep your grass at either end, check that your usual height falls inside it. Each pass trims a strip 8 inches wide. The width of the cut decides how many trips the mower makes, because a narrower strip takes more passes to cover the same area.
Obstacle Detection. The X3 Plus pairs an AI Vision camera, which is meant to recognize objects in the mower's path, with a bumper, a contact sensor that registers a touch. Sunseeker lists no ultrasonic sensors for it, while the UBHome M10 adds them. The X3 Plus also has a tilt sensor for safety. Sunseeker gives no figures for how well the camera picks out objects, so clear toys, hoses and fallen branches from the grass before each scheduled mow.
Battery And Charging. The battery holds 5,000 mAh, and Sunseeker gives 1.5 hours for a full recharge. The maker does not publish how long the X3 Plus mows on one charge, so the specifications cannot tell you whether it finishes a lawn of three-tenths of an acre in a single session. If it needs more than one session, the short charging time keeps the wait between them brief.
Specifications
| Yard size | Large Yard |
|---|---|
| Rated coverage | 3/10 Acre |
| Max slope | 30% |
| Drive | 2WD |
| Boundary | Wire-free |
| Positioning | RTK+Vision |
| Route planning | Systematic (RTK + Vision) |
| Obstacle avoidance | AI Vision + Bumper (Contact) |
| Cutting width | 8.0" |
| Cutting height | 1.6"-3.2" |
| Battery | 5000 mAh |
| Runtime | Not stated by the maker |
| Charging time | 1.5 |
| Noise | 52 dB |
| Waterproof rating | IPX5 |
| Rain sensor | Yes |
| Tilt sensor | Yes |
| App control | Yes |
| Scheduling | App Scheduling |
| Price tier | Mid Tier |
Specs last verified 2026-11-13. Based on the manufacturer's specifications and manual.
Specs provided for informational use only. Data may be incomplete or outdated. Read full disclaimer.
How It Compares
Sunseeker X7 Check Price on Amazon
Sunseeker X7 sits one tier up and shares this mower's RTK and camera navigation and its AI Vision camera, though it lists no bumper. Sunseeker rates it for three-quarters of an acre and slopes of up to 70%, with all-wheel drive. Its cut is wider, at 14 inches. It can cut shorter and taller than this mower, with a height range of 0.8 to 4 inches. It is rated louder, though, at 68 dB. Choose it for a bigger or steeper yard.
Segway Navimow i105N Check Price on Amazon
Segway Navimow i105N sits a tier down, though it shares this mower's 30% slope rating and its RTK and camera navigation. Segway rates it for a smaller lawn of up to 1/8 acre. It lists 1 hour of mowing per charge and a recharge of 1.5 hours. The IP66 rating on that mower covers dust-tight sealing and protection from strong water jets. Pick it for a small lawn if dust and water protection matter more to you than lawn size.
UBHome M10 Check Price at UBHome
UBHome M10 is another Mid Tier mower for a quarter of an acre, but UBHome rates it for much steeper slopes, up to 55%. It adds ultrasonic sensors to the AI Vision camera and bumper it shares with this mower. Its noise rating of 52 dB matches this one, and its IPX6 rating covers strong water jets. Its cutting height tops out at 2.4 inches, so consider it for a short lawn on steeper ground.
Worth Knowing
Sunseeker does not say whether an RTK reference station or antenna comes in the box, so confirm what is included before you order. The runtime, weight and warranty are not stated either, and neither is whether the mower can map more than one separate lawn. The X3 Plus has a rain sensor, though Sunseeker does not explain what the mower does once rain is detected. The IPX5 rating covers water jets, and the X in the code means Sunseeker gives no dust rating. On noise, the maker lists 52 dB, and a lower decibel figure means a quieter mower.
Frequently Asked Questions
Does the X3 Plus need a boundary wire?
No. You mark the lawn's edges in the app, and the mower navigates inside that boundary with RTK and camera vision.
How big a lawn can it mow?
Up to three-tenths of an acre, according to Sunseeker. For a larger lawn, the Sunseeker X7 is rated for up to three-quarters of an acre.
How steep a slope can it handle?
Up to 30%, by Sunseeker's rating. The Sunseeker X7 is rated for 70% and the UBHome M10 for 55%, so either suits steeper ground.
How long does a charge last?
Sunseeker does not say. It publishes no runtime per charge for the X3 Plus, only a recharge time of 1.5 hours.
What cutting heights does it offer?
From 1.6 to 3.2 inches. For a shorter cut, the Sunseeker X7 goes down to 0.8 inches and the UBHome M10 to 1.2 inches.
Does it mow in the rain?
Sunseeker does not say. The X3 Plus has a rain sensor and an IPX5 rating against water jets, but the maker does not describe how it responds to rain.
How loud is it?
52 dB, according to Sunseeker. Of the mowers compared here, the UBHome M10 carries the same rating, and the Sunseeker X7 is louder at 68 dB.
Do I need the app?
Yes. You draw the lawn's boundary in the app and set the mowing schedule there too, so you will use it from the first day.