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Community Moderator Alumni are previous members of the Moderation Team, which ensures conversations are friendly, factual, and on-topic. Moderators are here to answer questions, escalate bugs, and make sure your voice is heard by the larger Fitbit team. Learn more
Welcome to the forums @Irishgirl68!
Your Fitbit box will show at the bottom your serial number, like this:
Unfortunately, the serial number is not available on your Fitbit online account; however, you can request for this to our Customer Support Team. I'm sure they'll be glad to further assist you. 
Let me know if you have any questions, happy stepping! 
Best Answer
Community Moderator Alumni are previous members of the Moderation Team, which ensures conversations are friendly, factual, and on-topic. Moderators are here to answer questions, escalate bugs, and make sure your voice is heard by the larger Fitbit team. Learn more
Welcome to the forums @Irishgirl68!
Your Fitbit box will show at the bottom your serial number, like this:
Unfortunately, the serial number is not available on your Fitbit online account; however, you can request for this to our Customer Support Team. I'm sure they'll be glad to further assist you.
Let me know if you have any questions, happy stepping!
Best Answer