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Of course the serial number is clearly printed on the box it came in. It’s a shame you didn’t keep it. Also Fitbit does not engrave or imprint the serial number on the physical device itself. But I understand you don’t have the Inspire HR in front of you as well. But, when you so tap the settings gear icon then scroll down to and tap About then tap Regulatory Information and tap it. Locate your serial number there. Look for a string of 12+ characters (includes both numbers and letters) If all else fail you can contact Fitbit Customer service here: https://myhelp.fitbit.com/s/support?language=en_US I honestly don’t know if they will provide you with the serial number unless you can actually validate your personal information with them. 😃Please let me know if this answers your question.
