Product Details: The Sensaphone SAT4D Monitoring System is a convenient, powerful monitoring solution suitable for even the most remote locations with no telephone or network connections. Using satellite technology, the SAT4D provides virtually unlimited coverage throughout the United States and many other countries without relying on telephone lines, Ethernet connections, or cellular networks. The SAT4D can operate in temperatures ranging from -22° to 140°F without any effect on battery life. Website access allows users to access status information and make programming changes.