Select the device(s) and click on “Archive/Delete”. From the options list you may:
1) Archive - retain the data but deactivate the device(s), which then cannot be reactivated except by re-setting up again via the latest WiFi Sensor Software.
2) Clear - keep the device(s) active but delete all of the data.
3) Delete – delete the data and take the device(s) out of use.