The Downgrade speed class option allows you to define a bandwidth limit for your Air SIM so that you can manage your device's bandwidth usage based on daily or monthly limits. You can access this option from the User Console by clicking the checkbox next to the Air SIM, clicking the Details button to open the details dialog, and clicking the Watch tab.
When your device exceeds the limit(s) you define, its speed class will automatically be set to s1.minimum.
Please refer to the SORCOM Air product page for additional information.