... /1800/1900 MHz optional Full duplex communication with the host.Monitor the scene environment.Voice and message alert. Set alarm ON ... in to set alarm ON, OFF, Monitor, Output, intercomSend SMS to set alarm ON, OFF, Monitor, Output.5 group phone + 1 group ... .4VVoice of siren: 110dBPacking include :1 gsm main panel, 1 wireless pir sensor, 1 pair of door magnetic/ sensor,1 outer ...