Sunseeker S4

Last updated: October 21, 2026

Sunseeker S4
3.8/5#10 of 21 in up to 1/4 acre robot mowers
3.8

For quarter-acre suburban yards with trees or walls that block satellite signal, where a LiDAR mower avoids RTK setup. Yards with steep slopes need an AWD model.

  • 0.25 acresLawn size
  • LiDAR + visionNavigation
  • 42% (23°)Max slope
  • $4,610Price / acre
  • 7 inCutting width
  • 2 yearsWarranty
Check price at Amazon$1,151.63Check price at Sunseeker$1,279.99

Price checked October 21, 2026. As an Amazon Associate we earn from qualifying purchases.

Pros
  • No wire, no RTK antenna and no base station to place: LiDAR maps the yard from the app
  • Keeps its position under trees and eaves where satellite mowers lose signal
  • Up to 100 zones and no-go areas for awkward, multi-part yards
  • Fits through 31.5 in passages between front and back yards
Cons
  • Rear-wheel drive limits it to moderate 42% slopes
  • Narrow 7 in cut makes for slow passes
  • Cutting height is set by hand on the mower, not in the app
  • Tom’s Guide found it weak at edges, and it stopped working after a heavy rainstorm despite its IPX6 rating

How it scores

The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its size. How we rank explains each one.

Independent tests

What independent reviewers measured in their own yards. Lawns, grass and settings differ, so these are reported as written and not scored.

Tested byConditions
Tom's GuideOn the first cut, a charge lasted about 90 minutes. The test lawn was about 5,875 sq ft in two zones, and the backyard took just under 2 hours of cutting.

Specifications

Coverage
Lawn size (rated)0.25 acres (10,900 sq ft)
Max slope42% (23°)
All-wheel driveNo
Battery20 V 4 Ah
Navigation
NavigationLiDAR + vision
Boundary wire neededNo
Obstacle avoidance360° 3D LiDAR + monocular AI camera + bumper
Multiple zonesYes
No-go zonesYes
Cutting
Cutting width7 in (178 mm)
Cutting height1.6–3.2 in
Height adjustmentBy hand (knob)
BladesSix pivoting blades on a floating cutting disc
Edge mowingRide-on boundary cutting mode
Smart features
ConnectivityWi-Fi, Bluetooth
Rain sensorYes
Anti-theftOptional 4G module with anti-theft tracking
Build
Noise (rated)60 dB(A)
Water resistanceIPX6
Weight26 lb (11.8 kg)
Warranty2 years

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