I recently purchased the TP-Link Tapo P115 through Amazon. I always make sure to check if a product supports universal power supplies that can handle voltages from 100-240V. However, the product listing on Amazon did not mention its voltage rating. When it arrived, I noticed that the box stated "Rating: 100-125V~50/60Hz."

Despite this, I plugged it into a 220V~60Hz outlet, and the Tapo P115 worked without any issues—no short circuit or malfunction.

How is this possible? What signs or symptoms should I look for if the smart plug is not functioning correctly due to the voltage difference?

Thank you!