"A low-cost, disposable robot whose claims are written by marketing, not engineering."
The 'Sonar Smart Navigation' and '2150 Sq.Ft' coverage are marketing terms for a simple bump-and-turn robot that will wander randomly for about three hours, not a device that intelligently maps and cleans your specific pool.
This product is for someone with a small, flat-bottomed pool who needs light, supplemental cleaning of floating leaves and is treating it as a disposable, one-or-two-season purchase. Its only real virtue is the low upfront cost.
Anyone with a large pool, slopes, or significant debris like sand, silt, or algae should skip this. Buyers expecting methodical cleaning, wall climbing, or a multi-year lifespan are buying the wrong product. The lack of a brand means you own a product with zero support.