The Roborock S4 has been replaced with the Roborock S4 Max, a newer model with additional features and capabilities.
Roborock's S4 has been a chart-topping robot vacuum since it was released. In Roborock's model line, the S4 is the lowest priced of the more advanced S-line. The S4's laser navigation is excellent, and the vacuum-only robot does a great job with not only getting around, but doing so without getting stuck.
As far as longevity goes, the S4's lithium-ion battery will propel it for 150 minutes in balanced mode. Roborock claims that 150 minutes equates to vacuuming 2,700 square feet. Suction is impressive, too.
High-tech features include zone cleaning, Virtual Walls and Virtual No-go Zones. The Roborock App for iPhone and Android allows scheduled cleanings and selecting cleaning area by room.
Review the dimensions, color and other physical and visible characteristics of the robot vacuum.
The sensors and navigational aids the robot vacuum uses to move and assess floor surfaces and condition.
Run and recharge time for the robot vacuum cleaner.
The cleaning modes the robot vacuum cleaner is equipped with.
Additonal cleaning characterstics of the robot vacuum including its filter, cyclonic action and if it is rated for use in homes with pets.
If and how the robot vacuum integrates with mobile apps, smart home platforms and other technologies.
The surfaces the vacuum cleaner is capable of cleaning.
The manufacturer warranty and certifications for the vacuum.