Sunseeker S4 LiDAR Robot Lawn Mower for Up to 0.25 Acre (1000 m²), Vision AI + 360° 3D LiDAR Navigation, Wire-Free Virtual Boundary, Systematic Cutting, 42% Slope, App Control, 60 dB Quiet Mowing
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Availability:
In Stock.
Arrives
Tuesday, Jul 14
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Set name: Sunseeker S4
Features
- SELF-DRIVING-LEVEL NAVIGATION FOR REAL YARDS:Vision AI + 360 3D LiDAR builds a detailed 3D map of your lawn and plans systematic mowing pathsso S4 navigates real-world obstacles and uneven spaces with less babysitting and more predictable results.
- 3D LiDAR FOR COMPLEX YARDS: Say goodbye to GPS dead zones. Equipped with automotive-grade 3D LiDAR technology, the S4 navigates perfectly under dense tree canopies, tall eaves, and narrow passages where traditional RTK mowers fail completely.
- ZERO-WIRE, INSTANT 3D MAPPING: Set up in minutes, not hours. Drive the S4 via the App like a remote-control car to instantly generate a highly accurate 3D map of your yard. No perimeter wires, no base station calibration headaches.
- ALLSENSE FUSION SYSTEM: Powered by a 10 TOPS AI chip, the S4 fuses LiDAR point-cloud data with Vision AI. It maps, plans the optimal parallel cutting route, and mows with extreme precision, even in blinding sunlight or complete darkness.
- MILLISCEOND DYNAMIC AVOIDANCE: True intelligence on your lawn. The S4 doesn't just see static objects; it anticipates moving pets and avoids unexpected debris in real-time, ensuring zero collisions and a perfectly even cut.
Brand: SUNSEEKER
Power Source: Battery Powered
Material: Plastic, Polypropylene
Color: Silver Black
Style: Sunseeker S4 Robot Lawn Mower
Item Weight: 25 Pounds
Cutting Width: 7 Inches
Operation Mode: Automatic
Product Dimensions: 25"D x 16.5"W x 11"H
Smart Home Compatibility: Smart Home Compatible
Brand Name: SUNSEEKER
Model Number: SKRMS4
Required Assembly: No
UPC: 850060195723
Manufacturer Warranty Description: 2 Year Support
Manufacturer: SUNSEEKER
Manufacturer Part Number: SKRMS4
Item Type Name: SKRMS4
Material Type: Plastic, Polypropylene
Power Source: Battery Powered
Operation Mode: Automatic
Smart Home Compatibility: Smart Home Compatible
Maximum Adjustable Cutting Height: 3.2 Inches
Minimum Adjustable Cutting Height: 1.6 Inches
Item Weight: 25 Pounds
Cutting width: 7 Inches
Item Dimensions D x W x H: 25"D x 16.5"W x 11"H
Color: Silver Black
Style Name: Sunseeker S4 Robot Lawn Mower
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Tuesday, Jul 14
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Set name: Sunseeker X7
I don’t normally replace big yard equipment often, so buying a robot mower was already a big decision. The first one I purchased — a mid-range model from another brand — was such a disappointment that I ended up returning it. It got stuck constantly, struggled on my slopes, and lost signal in the same spots every week. After that experience, I honestly didn’t want to go through another setup. But the X7 has been a completely different story. What convinced me to keep it is simply that it works where the previous mower failed. My yard has two sloped sections and a few tight passages, and the X7 climbs them without hesitation. I watched it handle an off-angle slope that my last mower wouldn’t even attempt without slipping. Its ability to recover from tricky spots is also much better — no more daily rescue walks for me. The satellite navigation has been surprisingly stable too. I expected the same GPS dropouts I dealt with before, but the X7 stays locked in and maintains a consistent mowing pattern. Considering robot mowers aren’t something you buy often, I’m relieved this one actually lives up to what it promises. For the first time, I feel like I can just let it run and not think about it.
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Reviewed in the United States on May 4, 2026 by Adam
Set name: Sunseeker X3 Plus
I’ve been using the Sunseeker X3 Plus for about a week now, and what surprised me the most is how clean the edges look. My yard is around 0.2 acre—not huge, but with several corners and walkways—and the X3 Plus gets impressively close to the borders. I still do a quick touch-up here and there, but far less than with my old mower. Navigation has been steady so far. Even under trees and near the fence line, it stays on track without random wandering. The app seems much smoother than some older reviews suggested—setup was simple, and when I didn’t understand a setting, customer support actually responded quickly and walked me through it. Overall, it keeps the lawn looking neat with minimal effort from me. For anyone wanting tidy edges and a mower that mostly takes care of itself, this one’s been a pleasant surprise.
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Reviewed in the United States on April 30, 2026 by Julia
Set name: Sunseeker S4
I recently received the Sunseeker S4 LiDAR Robot Lawn Mower. My initial impression was that this is a highly advanced piece of machinery, utilizing the same 3D LiDAR technology found in autonomous vehicles to navigate without the hassle of physical boundary wires. I used this as a dedicated mower for my backyard. Having used the Sunseeker S7 in my front yard for a year, I was already a fan of the brand, and the S4 did not disappoint in providing a consistent, high-quality cut for my back lawn. What I particularly liked about the product is its advanced navigation and systematic cutting. Unlike cheaper brands I've tried, the S4 uses Vision AI + 360° 3D LiDAR to build a precise map of the yard, meaning it doesn't just bump around randomly. It handles slopes up to 42% easily and avoids obstacles like toys or pets in real-time. The wire-free virtual boundary is a game-changer for setup, and the 60 dB quiet operation means it can run without disturbing the peace. Compared to other budget robot mowers, the performance and reliability of the Sunseeker line are in a completely different league. I don't have any specific dislikes or areas for improvement. The app control is intuitive, and the systematic mowing paths ensure every inch of the yard is covered efficiently. In summary, the Sunseeker S4 is an excellent product for anyone looking for a premium, wire-free mowing experience. Its superior navigation and ability to handle complex terrains make it a highly recommended choice, especially for those who have been frustrated by the performance of cheaper alternatives.
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Reviewed in the United States on April 29, 2026 by M. H.
Set name: Sunseeker S4
The media could not be loaded. The geek in me really likes this robot. It is well thought out from the packaging, accessories and spare parts, phone app, and even the shape of the robot itself. My experience of watching it [and they advise that it should not be operated fully autonomously] is like watching a new puppy; wonder and amazement with the knowledge that this little guy could get into trouble. This is a nice product, and undoubtably would suit the right person quite well. My opinion, but I think the target user has a push mower (perhaps with motor assist), and a dry or well drained, manicured lawn, up to the recommended ¼ acre. That’s not me. My property is much larger, never dry during the spring and autumn shoulder seasons, rarely completely dry during the summer, and the grass species are ones that will survive in standing water, bitter cold winters, and blazing sunshine in the brief summer. My riding lawn mower has tractor tires. It is probably no surprise that it ships in a large, heavy box. Unboxing and setup for charging was pretty-much intuitive, revealing the expected parts and accessories. Pleasant surprises were the printed cardboard insert that served as a quick reference, a roll of fitted red and white reflective strips to apply to the mower, and spare blades. Initial setup involved connecting the long charger and docking station cords [with a weather sealed connection], removing the shipping card and rolling the robot into the docking station, and plugging into a ground-fault protected outlet. A short whirring sound was followed by the confidence-inspiring blinking of the battery indicator. In under an hour from unboxing, the battery was topped up and ready for use. While charging and before use, the 26-page English Instruction Manual was read. [French and Spanish sections are also included.] These caution, ”Do not let the product operate when there is standing water in the area, such as an area with pools of water formed by heavy rain,” and all but preclude automatic operation on most of my property - though not a fault of the product. The app was downloaded from the app store and installed. It is required for initial setup [apparently programming coordinates into the robot], manual operation [driving the robot – left, right, forward and reverse], timed operation, and notifications. I experienced a little frustration with the app related to my network. For testing, I chose an area of rolling surface terrain about 20 x 60 feet generally rectangular, and dry enough to walk on without sinking. Two obstacles included a raised planting bed and a soft soil mound left over from a planting bed that had been removed. Setting up the boundaries was done manually as I could not convince the robot to do it automatically [and there was nothing to clearly define boundaries like fence or sidewalk]. The docking station was slightly outside the boundary, so the robot was carried a few feet. Operational noise gets lost in the background. The initial cut was quite impressive. The robot cuts in narrow, overlapping rows, and appears to turn around and recut spots if the grass is too long. This apparent feature would seem to make it ideal to maintain a manicured lawn. Battery performance [including mapping the outer perimeter and initial cut] lasted about half the area. The battery was recharged in a couple hours and finished the cut. [By my calculation at this rate ¼ acre would require four cut / charge cycles - most of the sunlight hours in a day.] This calculation may not be fair. My weather is mostly cloudy, most days. Manual setup and operation apparently require a positioning signal, and observation suggested that the signal was lost (e.g. boundary setup was frequently slow or unresponsive, and in operation the robot wandered well outside the boundary, then – presumably when coordinates were re-established - turned around and returned). Extra work performed -at least initially, though might improve as the robot better learns the area. As advised, operation should be monitored, and I was able to do yard work within sight distance. I also monitored operation by watching feed from a security camera. A few rescues were required (including the robot’s instance to climb the soft soil mound - see photo), while the solid structure of the existing raised bed was avoided by inches. When a rescue is required, the robot stops with an error, a notification is sent, and well-placed handles allow it to be lifted to a safe place to restart. Once the robot completed cutting the area, I received a notification on the app. Because I had initially carried it to the space, it spent a few minutes circling, and then locating and docking itself to top up the battery. Smart. [The docking station was in a sheltered area that was probably shielded from coordinate mapping.] If you like advanced products, like watching this thing, maybe don’t like mowing, and you have the yard for it, this might be for you. [Minor edit Mar 18, 2026.]
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Reviewed in the United States on March 16, 2026 by Kab