If you have a X2 transponder, you need to get busy for the upcoming weekend: Make sure your subscription is active (and doesn't expire in the next week or so) To ensure the functionality of your X2 Transponder, reactivate it periodically with the X2 RaceKey (at least once every 5 days). When the transponder is not reactivated, it will stop sending out its transponder number, and the subscription indicator light will flash red 5 times per second. Make sure the firmware is up-to-date Make sure it's fully charged. You can do all this through your Mylaps Connect app. If you have the old TranX260 transponder, your life is much less complicated. Just make sure it's fully charged before you had out to the track. For everyone, the maximum mounting height is 120 cm (4 ft.) for bikes. Clear view to the asphalt. The lower on the fork tube the better.