The Apollo GSM Modem allows automatic remote monitoring anywhere there is GSM cellular service. Simply sign up for service, insert the SIM card obtained from your service provider, and connect the Apollo Communications Gateway to the modem. Connects the ACG Communication Gateway with connection via GSM cellular telephone to the internet when direct Ethernet based service is not available. Requires one ACG Communication Gateway for each system being monitored. The user will be required to provide the GSM SIM card for his cellular service.