2.7.3 Unlock under Monitoring Status (access control module required)
Under monitoring status, VTS or VTH can remotely unlock door. VTO will return to
standby interface after call ends or countdown stops.
2.7.4 Unlock via IC Card (access control module required)
By swiping authorized IC card, you can unlock door after local verification.
2.8 Compensation of Light
In dark environment or at night, the VTO adopts auto photoreception technology
which achieves light compensation in connecting status.
2.9 Vandal Proof
There is one channel of vandal proof which will generate alarm sound and report to
the manager center once VTO is forced to leave the wall.
