Take a moment to think about how many things in your home are now automated. Your robotic vacuum cleans the floors. The temperature on your thermostat changes before you even arrive home. The camera by your front door recognizes people arriving. 

Now go outside. You will find that your lawn is still waiting for you to take out a gas-powered mower and mow it every Saturday. Indoor smart home technology is relatively mature, but the moment you step outside, things get more complicated. This gap has been a persistent challenge for the smart home industry. 

Why the yard got left behind 

There are good reasons outdoor automation took longer. Indoors, the problems are bounded: walls, flat floors, and predictable furniture. A robot vacuum maps the living room and gets to work. Outside, it’s not so simple. Terrain changes. Grass grows unevenly. There are trees, slopes, flower beds, patio chairs that get moved every weekend, garden hoses left out, kids’ toys scattered across the lawn. That’s all before considering the weather. And unlike a floor, a yard doesn’t always have walls or fences to define its edges. 

That last point is responsible for the biggest source of friction with early robotic lawn mowers. Most required homeowners to install a boundary wire around the perimeter of their yard. It involved burying or staking a physical wire into the ground to tell the mower where to stop. This worked, technically. But it was tedious to set up and easy to damage, making it a real barrier to the kind of effortless experience people have come to expect from indoor smart home devices. 

The alternative to a boundary wire was to install an RTK base station, which involved mounting an antenna and relying on GPS to guide the mower. This resolved the issues with wire installation, but could result in poor performance under dense foliage or next to fences and buildings. 

The tech that’s changing the math 

Aware of these hurdles, manufacturers have brought a new crop of robot mowers to market. The Sunseeker S4 is one of them. Among its peers, it has a notable feature: there is no boundary wire to bury and no RTK base-station antenna to mount on a roofline or pole. The experience of setting up the S4 more closely resembles setting up a new robot vacuum, without the trench-digging or antenna-mounting steps required by some earlier systems. The S4 achieves this by using its onboard sensors to understand the yard directly. Its AllSense Vision AI and 3D LiDAR work together to build a live picture of the mower’s surroundings, helping it identify common backyard obstacles and navigate messy, lived-in yards. 

However, these capabilities come with some constraints. Importantly, the S4 is not compatible with St. Augustine or Zoysia lawns. The remaining limitations are relatively narrow. The Sunseeker S4 can maintain yards up to 0.25 acres, can handle slopes up to 42% (22°), and can process up to 100 different zones across 5 maps, meaning a single unit can tackle split front and back yards. Many suburban lawns fall within these criteria. Full compatibility, pricing, and availability information is available through Sunseeker’s official channels.  

​What using it looks like 

Setup happens via the app. You create your mowing zones and set a schedule. Compared to previous generations, setup is notably shorter and simpler. No digging trenches. No staking boundary wires. No roofline RTK antenna setup. 

Once it’s running, the S4 uses its LiDAR and Vision AI to detect and attempt to navigate safely around common yard objects such as toys, pets, outdoor furniture, and garden features. It mows on a regular schedule, which is better for the grass: frequent light cuts are healthier than the scalp-and-recover cycle that many homeowners default to when the mower finally comes out on Sunday afternoon.  

The whole experience reflects how the category is evolving. The user sets it up, checks in through the app when they want to, and otherwise stops thinking about mowing. 

The robot vacuum parallel 

The comparison is hard to avoid. Ten years ago, robotic vacuum cleaners were an innovation. At first, most of them weren’t very practical. Early models randomly bounced off every object in the home, doing more to entertain than to save your labor. But over time, they got better. Setup became easier. Object detection improved drastically. Precise mapping became feasible. Eventually, robot vacuums transitioned from novelties to realistic replacements for your vacuum cleaner.  

Robotic lawn mowers appear to be moving towards a similar threshold. The category of AI lawn mowers has progressed from cumbersome, installation-heavy gadgets to practical outdoor smart home appliances. The Sunseeker S4 is one example of this shift. A 3D LiDAR robotic mower that does not require setting boundaries using a perimeter wire and can navigate a “real” yard is a completely different type of product than those available within the category five years ago. 

Are robot mowers ready for prime time? 

The change in approach among robot mower manufacturers is good news for smart home users who are eager to automate their lawn care. The initial setup overhead and friction are steadily being reduced compared to previous generations. 

For prospective users with compatible yards under 0.25 acres, the options for robot mowers that don’t require wire or RTK station installation are growing. If you’ve been considering a robot mower but have been hesitant due to the challenges, the barrier to entry is now lower than before.

However, the limitations may still be too narrow for some users. A mower like the S4 is not going to replace a riding lawn mower for large lawns of premium grass like St. Augustine, nor will it fare well with steep or otherwise extreme terrain. It may still be some time before the market sees equipment capable of addressing these challenges.  

More information about the S4 and Sunseeker’s full lineup of robot mowers is available on Sunseeker’s official website and its Facebook, Instagram, and YouTube channels.  

Disclaimer: Pricing and availability are accurate at the time of publication but may change. Prices may fluctuate during major retail events such as Prime Day. Please check the retailer’s website for the most up-to-date pricing and promotions. 

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As SpaceX counts down to what could be the largest IPO in history, the race to build the next generation of launch vehicles is heating up. Asia wants in. Startups across Australia, India, Japan, and South Korea are racing to establish themselves in a market long dominated by the U.S. and China.

One of them is Unastella, a four-year-old South Korean startup that just closed a $24 million Series B, bringing its total funding to $44 million. The company launched its own rocket, the UNA EXPRESS-I, from South Korean soil in May 2025.

The Seoul-based rocket startup is developing its own launch vehicles and engines, with an initial focus on small satellite launch services. Unastella’s near-term focus is validating its technology and business model through orbital launches, with crewed suborbital spaceflight as a longer-term goal, founder and CEO Jae Park told TechCrunch.

Unastella uses a kerosene and liquid oxygen propulsion system, one of the most proven combinations in rocket history, and one that is also used by SpaceX’s Falcon series. On top of that, the company swapped out the traditional turbo pump for an electric motor pump, a simpler and cheaper alternative that Rocket Lab has already validated in flight.

The tradeoff is payload. Electric motor pumps are heavier, which means less room for satellites. But Park said that’s a deliberate decision.

“We’re not an R&D group trying to build the most impressive rocket,” Park said. “We’re a commercial launch company trying to get to market fast.”

Park also notes that Unastella handles everything in-house, such as design, manufacturing, ground operations, and flight data. The UNA EXPRESS-I launch last year was the first real-world test of the entire system end-to-end, Park said.

The CEO has spent his entire career working on rocket engines. Before founding Unastella, Park worked on combustion systems for Korea’s Nuri rocket — the country’s first indigenously developed orbital launch vehicle, built by the Korea Aerospace Research Institute (KARI). He then moved to the German Aerospace Center in Berlin to work on European launch vehicle engines, and returned to Korea to join another rocket startup before deciding to build his own.

Unastella isn’t generating revenue yet, but investors appear to be backing the startup’s roadmap. Altos Ventures led the Series B, joined by Korea Development Bank, Strong Ventures, and Hana Ventures, among others.

UNA EXPRESS-II, targeted for next year, is the launch Park is really building toward. Reaching 100 kilometers would mark a significant milestone, one he believes will open the door to partnerships with South Korea’s major aerospace and defense firms.

The 22-person startup has already laid the foundation and developed institutional relationships. Korea’s national space agency has flown components on UNA EXPRESS-I, and the Korea Aerospace Research Institute has transferred electric motor pump technology to the company.

Unastella is not alone in the race to tap into the global space launch market, which was worth roughly $15 billion in 2023. By 2030, it is projected to nearly triple to $41 billion, according to Grand View Research.

South Korea’s commercial launch sector is still in its early stages, but the field is already taking shape.

Hanwha Aerospace, the country’s largest defense conglomerate, took over the government-built Nuri rocket last year after acquiring full technology rights from KARI. Two startups are also competing: Innospace, which went public on the Korean stock exchange and has conducted a sub-orbital launch, and Perigee Aerospace, which is developing its Blue Whale rocket. None have yet achieved a commercial orbital launch. South Korea’s space agency KASA, established in 2024, has committed $266 million over seven years to build out launch infrastructure — a sign that the government is betting on the private sector to take the lead.

The competition extends well beyond Korea. In Asia, China leads the pack: Galactic Energy, LandSpace, and iSpace have all conducted multiple launches. Japan’s H3 rocket, developed by JAXA and Mitsubishi, completed its first successful launch in 2024, while startup Interstellar Technologies is building its own small vehicle. In Australia, Gilmour Space attempted its first orbital launch this year. And then there is Rocket Lab — founded in New Zealand, now listed on Nasdaq — which remains the only Asian-founded company to have built a commercially viable launch business.

This story has been updated to reflect that UNA EXPRESS-II is targeted for launch next year, not later this year as originally reported.