We are very proud to offer this little gem! The HAI C3 GSM Communicator is great if you want to connect this to your alarm system for making call outs without a land line, but you can also hook land-line phone lines into it to make calls out over the cellphone frequency.
Just insert a SIM card from your mobile carrier or from a pre-paid phone and you're off to the races. This is a definite consideration if you don't have a land-line and want to your security system to call out for self-monitoring. Check out the video below for an in-depth look at this awesome device.