a$.$ A top competitor that presents a competitive threat is Ecovacs, which is one of the top three brands of in$-$home robots worldwide and has $65$ percent of the market in China.

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b$.$ SharkNinja has presented a competitive threat to iRobot based on its lower price and different models.

c$.$ Eufy Robovacs proved to be of higher quality and lower price, posing a threat to iRobot.

d$.$ Ecovacs has a strong financial position and ample working capital to continue R&D and aggressive marketing.

e$.$ SharkNinja has a strong brand name, global operations, and a broad distribution network.