Next time you order something from , a robot might greet you at the doorstep. The San Francisco on-demand delivery firm today unveiled Serve, a four-wheeled delivery rover that’s capable of autonomously navigating sidewalks and city streets.

It’s the first commercial product from Postmates’ new research and development lab, Postmates X, and comes as Postmates reveals that it’s now averaging 4 million deliveries each month in 550 cities.

Serve’s colorful, LED-laden exterior belies its complex

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