Smoke alarms are primarily designed to wake and or/alert people in a building that a fire has broken out so that they can safely escape in time, and contact the proper emergency services. But the Firetext goes one step further. It actually features a SIM card slot, and when it detects smoke it will send a text to up to 4 different numbers. I assume it’s meant as a way to alert people to an emergency situation when they’re away from the building where the detector is located. Cost $144 .