Some access points have the option to set the radio to Sensor mode. In Sensor mode, the radio does not service clients. Instead, the radio changes channels and functions as a sensor for ExtremeLocation, which enables the AP to report to ExtremeLocation. On some AP models, Sensor mode can co-exist with any radio mode, as the mode is configured per radio rather than per AP. The AP scans all channels that are allowed by the selected country.
Sensor mode is configured on individual access point radios, not at the site level.