Apartment Intercom

Product features:
◆ Support 200 sets of numbers, each number can be set in the time period to control the relay to open the door.
◆ A relay output is used to control to open the door, connected when there is the number of incoming users , And it will automatically disconnect at set time.
◆ After a user calls to control to open the door, it can send SMS to the user about its action.
◆ 000~999 seconds, we can control the relay closing time, 000 indicates: the relay is closed for 0.5 seconds then disconnected. 999 indicates: the relay can be closed until the same number incomes again then disconnected.
◆ SMS commands can be used to query the current state of the host (relay status and GSM signal value).
◆ SMS can be regularly uploaded for the current state of the host to the first user number.
◆ Use the clock on the module, each time the host sends SMS to itself to correct the time.