All our systems have an auto-dialling alarm. If triggered it will automatically dial five numbers sequentially and send an SMS message to call for help via the GSM mobile network. It the first number on the list is busy it will dial the next number and so on. It will call the police or a local security firm. You can change these numbers at any time, even remotely. It does require a SIM card and a monthly subscription It will call for help when a set alarm zone is breached or if the SOS button is pressed. You can add a bodily warn SOS button if you wish. Ideal for the sick or vulnerable. Add extra alarm zones wirelessly whenever you want.