Head to head
Segway Navimow X390 vs Sunseeker S4
Price, coverage, slope, navigation, and drive for Segway Navimow X390 and Sunseeker S4, side by side and cited.
- Store prices · checked 1 h agoVerified · checked 5 wk ago
2compared
10,118 m² (2.5 acres)largest lawn
Segway Navimow X390 (Navimow X390)·Sunseeker S4 (Sunseeker S4)
Your lawn
Set your lawn to see which of these fits it.
Drive
2-wheel drive
2-wheel drive
Obstacle avoidance
Navigation
Wire-free. RTK GNSS plus onboard AI vision, no perimeter wire.
Wire-free. A 360° 3D LiDAR fused with an AI camera (L-SLAM plus V-SLAM), no RTK antenna, base station or perimeter wire.
Cutting
23.7 cm (9.3 in) cut, 50 to 100 mm (2.0 to 3.9 in) height, about 60 dB
18 cm (7.1 in) cut, 41 to 81 mm (1.6 to 3.2 in) height, about 60 dB
Rain
Weather-adaptive: pauses and returns to the dock in rain, snow, or frost (IP66)
Rain sensor sends it back to the dock (the LiDAR cannot measure in rain or fog); IPX6
Anti-theft
GPS tracking, PIN code, lift/burglar alarm, and a geofence out-of-boundary alert
PIN code and lift and tilt sensor; a 4G-GPS anti-theft module is optional
Connectivity
4G, WiFi, Bluetooth (5-year free 4G service)
Wi-Fi and Bluetooth; optional 4G module; Alexa and Google Home; over-the-air updates
Released
2025
2026
A check marks the lower price, the higher score, the larger coverage, and the steeper slope. Our pick below is derived from those same specs; the right choice still depends on your lawn, your budget, and how you'll use it.
Our pick
Which to buy
Best buySunseeker S4
For most lawns, the Sunseeker S4 is the better buy at $999.99: it covers up to 1,000 m² (0.25 acre), about $3,499 less than the Segway Navimow X390. Step up to the Segway Navimow X390 only if your lawn is larger than 1,000 m² (0.25 acre) or steeper than 42%.
From $999.99The bottom line
What actually differs
- Sunseeker S4 has the lower price ($999.99).
- Segway Navimow X390 covers the most lawn (10,118 m² (2.5 acres)).
- Segway Navimow X390 handles the steepest slopes (up to 50%).
Go deeper
Open the full record
BestRobotMower.co is an independent informational comparison site, not a manufacturer or a retailer. Specifications and prices are curated from public sources and can change or be incomplete. Always confirm the current spec, price, and availability with the manufacturer or seller before buying. Coverage and slope figures are rated maximums on an open lawn; real performance depends on your yard.