Your Stages Power meter serial number is printed on a sticker inside the power meter battery compartment, as well as listed at the top of the screen when connected to a power meter via the StagesPower app, while the Stages Dash serial number can be found on the sticker adhered to the back of the unit.
Your power meter can be used at registration to activate a 2-month trial of Stages Link premium services.
The power meter serial number is a 10 digit number (that starts with 0) printed inside the battery compartment of your power meter. Note that within the app and in your account, it will show up without the proceeding 0s.
Stages Dash serial numbers do not need to be entered at registration and when synced through the Stages Link app will automatically activate your Stages Link trial period.