Robot mower with LiDAR: Sunseeker S4 cuts grass on up to 10,800 square feet

Robotic lawn mowers continue evolving beyond basic perimeter wire systems, and Sunseeker's new S4 model demonstrates this shift with its LiDAR-based navigation. Priced at $1,599 for preorders with US deliveries starting March 10, the S4 replaces traditional RTK antenna systems with a 360-degree LiDAR scanner paired with an AI camera. This combination forms what Sunseeker calls its "Allsense 3D Sensing System," designed to create precise maps while detecting obstacles like garden tools or toys.

The S4 marks a departure from Sunseeker's existing product lines. Unlike the camera-focused V3 series or RTK-dependent X series models, the S4 adopts the LiDAR approach gaining traction among competitors like Roborock and Ecovacs. This technology enables radar-based automatic mapping with a "Drop to Go" feature that simplifies setup by eliminating physical boundary wires. The system automatically charts the yard during initial runs, adapting to landscapes covering up to 10,800 square feet (approximately 0.25 acres).

Performance specifications position the S4 for moderately complex properties. It handles slopes up to 42% (about 22 degrees) and includes specialized modes for meticulous edge trimming along borders and walls. The dual map storage function allows homeowners to manage distinct lawn zones independently, useful for properties with separated front and back yards. Battery specifications remain undisclosed, but the listed runtime should accommodate the maximum coverage area through efficient path planning.

Comparisons show Sunseeker entering a competitive mid-tier segment. At $1,599, the S4 sits below premium RTK models like Husqvarna's offerings but above basic wire-guided units. The LiDAR navigation potentially offers advantages over camera-only systems in low-light conditions, though real-world testing will determine reliability against challenges like overgrown grass or sudden weather changes. For homeowners with yards between 5,000-10,000 square feet featuring slopes and landscaping obstacles, the S4 presents a wire-free alternative with modern sensing technology.

Retail listings confirm the March delivery timeline, though Sunseeker hasn't clarified whether the current price represents a permanent MSRP or limited promotion. As robotic mower adoption grows, the S4's success may hinge on how effectively its sensor fusion handles diverse garden environments compared to established RTK and wire-based systems.