The Directed SmartStart DSM450 GPS 3G Module connects via the AT&T nationwide 3G network. The DSM450 enables 2-way digital vehicle control capabilities including remote start, locate, lock, unlock, panic and more. Through the free app, you'll know the status of the vehicle, including if it's running, if the doors are locked or if the trunk is open. You'll also receive real time alerts when the alarm is triggered, the vehicle enters or exits a SmartFence or if the vehicle is speeding--all from the convenience of your smartphone. The module is plug and play compatible with existing SmartStart systems. It is also compatible with nearly all Directed remote start and security systems, and thanks to its complement of analog outputs, it can also be used in standalone-mode. This means the DSM450 is compatible with practically every vehicle on the road.