285.4 Compensation of LightIn dark environment or at night, the VTO adopts auto photoreception technology whichachieves light compensation in connecting status.5.5 Vandal ProofThere is one channel of vandal proof which will generate alarm sound and report to themanager center once VTO is forced to leave the wall.5.6 Restore BackupRestore Card InfoIf you encounter abnormality with card info or accidently restore default settings, you canrestore card info with this function.Restore VTH InfoIf VTH info is mistakenly changed, you can restore VTH info with this function.Note: Every half hour, VTO automatically saves card and VTH info in the system. If youwant to restore card and/or VTH info, you must restore within half hour after your lastoperation that change these info.